Are they definitely HF, The link you provided was for HID iClass ( HF )
FYI
HID also make LF.
Did you scan your card with TagInfo or similar
if so,
Just be aware you MAY want to Hide / change / mask you UID…
The more specific you can be about what you are dealing with, the more specific we can be with the resources you are after.
There are plenty of resources we can point you towards, but rather than flooding you with them blindly, I have a few in mind for you already but will wait for your reply