<PAGE>

                                  EXHIBIT 31.2

                FIRST FEDERAL OF NORTHERN MICHIGAN BANCORP, INC.

                                   FORM 10-KSB

                          YEAR ENDED DECEMBER 31, 2007

                    CERTIFICATION OF CHIEF FINANCIAL OFFICER

            Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Amy E. Essex, certify that:

(1)  I have reviewed this annual report on Form 10-KSB of First Federal of
     Northern Michigan Bancorp, Inc.;

(2)  Based on my knowledge, this annual report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary to
     make the statements made, in light of the circumstances under which such
     statements were made, not misleading with respect to the period covered by
     this annual report;

(3)  Based on my knowledge, the financial statements and other financial
     information included in this annual report fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this annual report;

(4)  The registrant's other certifying officers and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over
     financial reporting (as defined in Exchange Act Rules 13a-15(f) and
     15d-15(f) for the registrant and have:

     a)   Designed such disclosure controls and procedures, or caused such
          disclosure controls procedures to be designed under our supervision,
          to ensure that material information relating to the registrant,
          including its consolidated subsidiaries, is made known to us by others
          within those entities, particularly during the period in which this
          annual report is being prepared;

     b)   designed such internal control over financial reporting, or caused
          such internal control over financial reporting to be designed under
          our supervision, to provide reasonable assurance regarding the
          reliability of financial reporting and the preparation of financial
          statements for external purposes in accordance with generally accepted
          accounting principles;

     c)   Evaluated the effectiveness of the registrant's disclosure controls
          and procedures and presented in this report our conclusions about the
          effectiveness of the disclosure controls and procedures, as of the end
          of the period covered by this report based on such evaluation; and

     d)   Disclosed in this report any change in the registrant's internal
          control over financial reporting that occurred during the registrant's
          fourth fiscal quarter that has materially affected, or is reasonably
          likely to materially affect, the registrant's internal control over
          reporting; and

(5)  The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of registrant's board of
     directors (or persons performing the equivalent functions):

     a)   All significant deficiencies and material weaknesses in the design or
          operation of internal control over financial reporting which are
          reasonably likely to adversely affect the registrant's ability to
          record, process, summarize and report financial information; and

     b)   Any fraud, whether or not material, that involves management or other
          employees who have a significant role in the registrant's internal
          control over financial reporting.


March 31, 2008                          /s/ Amy E. Essex
Date                                    ----------------------------------------
                                        Amy E. Essex
                                        Chief Financial Officer, Treasurer, and
                                        Corporate Secretary