That is exactly why you never send anyone your scanned passports or degrees online because in China they normally sell the information on the black market, build credit profiles, or yes, use them for the illegal importation of cars that require foreigner credentials.

I understand what you're saying, but most direct employers in the Chinese education sector as well as Chinese recruiters request scanned passports and paper qualifications from job applicants.
I have no credit cards nor bank accounts in foreign currency, bar one, which is very seldom hugely in the black. I've had no problems with internet fraud to date, but maybe I've just been lucky!
It seems a pity to restrict the number of jobs one can apply for, here in China, by never submitting passports nor degrees electronically! But that appears the best way to go to thwart internet fraudsters. Better to be safe than sorry, I suppose!