In the context of PDF files, CIDFont+F1, F2, F3, and F4 are not specific font "brands" you can download, but rather internal placeholder names generated by software during the PDF export process.
In some PDF tools, F1, F2, F3, F4 are virtual/postscript font names given to substituted fonts when the original CID font is missing. cid font f1 f2 f3 f4 better