Yes. There are several programs that will allow you to combine multiple documents into a single PDF.
An example of a free online program that will merge multiple pdf documents into a single file is Smallpdf: https://smallpdf.com/merge-pdf.
All you need to do on that page is click “Choose files” and select the PDFs you’d like to combine (you will need to have previously downloaded or scanned the PDFs you’d like to combine.
After you’ve selected your files, click “Merge files,” arrange the pages in the order you’d like them to be in the combined PDF, and click the “Merge PDF” button. The program will then combine each of your selected documents into a single, multi-page PDF.