In the world of PDF documents, "CIDFont+F1" is a placeholder name generated by software when a real font (like Arial or Times New Roman) isn't properly embedded during the export process.
The Mystery of "CIDFont F1": Why You Can’t Find a Download Link cidfont f1normal font free download link
What you should do instead:
If you have access to Adobe Acrobat Pro (not just the free Reader), you can edit the PDF properties. In the world of PDF documents, "CIDFont+F1" is