I have no idea, and have no way of finding out. It could either be a private pool or a botnet of actual biblepay wallets.
I know we had a botnet in China, as I received a lot of complaint emails when we forcefully upgraded from 1.0.6.7 to 1.0.7.1, they were blocked by the Chinese government, and at that time, we had 20% of our blocks being solved by 1.0.4.0 (IE what I believe was the botnet), so it could be that the botnet finally upgraded to 1.0.7.1 (see exec versionreport in the rpc).
Hi,
Thank, you. I guess China's users also has the right to mine this coin

We'll just have to do better than them, but I don't have an idea how

Best regards,
Simon