The claims reported in various places suggest that people in Iran have actively observed this certificate used in MITM attacks on gmail connections. No hard evidence yet, and no idea what original source people keep repeating (possibly the pastebin itself).
It's weird, isn't it? From zero to accepted fact on the basis of some guys assumption mentioned in the title of a pastebin dump. The only other original source I've been able to find is this:
when I used a vpn I didn't see any warning ! I think my ISP or my government did this attack (because I live in Iran and you may hear something about the story of Comodo hacker!)