This wallet was mine, in 2012 I bought some BTC than I wasnt very educated and I forget the password, but all my passwords at that time was only number and some number and letter without capital letter, I shared it before with 3 guys that claimmed be able to brute force but till now nothing happenned and the funds are still in the hash, may someone here find and we will have a good time on it.
It means some of those people have violated your secrecy.
But I am surprised that the wallet has not been cracked yet given that it is between 4-8 chars with only numbers and letters. That would be easy fodder for Hashcat and a lone (high-end) GPU. Are you sure these are the exact constraints of the password? Maybe there could be some non-latin characters that you have forgotten about?