Because "F1" isn't a real font name, these downloads are almost always shells for adware or browser hijackers.
The inclusion of the phrase "hot free download" in the search query introduces significant risk. cid font f1 f2 f3 f4 f5 hot free download
If you search for "CID Font F1 Free Download," you will find sites promising a .zip file. Because "F1" isn't a real font name, these