I believe you can no longer google hash values?
It used to work years ago but I just searched for "6867d9167683fb8f42558a81ad107f5b" and got zero results.
That is the MD5 hash for "asd3" and this is short enough that it should be on one of those MD5 web pages...
Update: Wow, zero results for "2585ecdb9a753ca54a96fae62bfda433", the MD5 hash of "r68". They must be filtering them out on purpose.
Update 2: Googling "2585ecdb9a753ca54a96fae62bfda433" now turns up this exact 10 minute old comment, so your approach might work if the hash is embedded within "real" content.
Update: Wow, zero results for "2585ecdb9a753ca54a96fae62bfda433", the MD5 hash of "r68". They must be filtering them out on purpose.
Update 2: Googling "2585ecdb9a753ca54a96fae62bfda433" now turns up this exact 10 minute old comment, so your approach might work if the hash is embedded within "real" content.