Since this is an .ipa file from a third-party source (not Apple), there is no guarantee the code hasn't been modified.
While these archived files are useful for digital preservation, using them comes with risks:
This specific filename, download-whats-app-messenger-v22-v406834304-64bit-os120-ok14-user-hidden-bfi2.ipa , is the digital footprint of a (specifically an .ipa for iOS devices) that has been extracted and archived by a third-party source. The Story Behind the File
People usually search for this exact string when they are trying to "downgrade" their app or install it on a "jailbroken" device where the standard App Store is no longer an option. Important Technical Context