Why is that suspicious? Its not unusual for a recruiting company to withhold information. Its in their interest to do so because they charge a fee to recruit pilots. Thats how the business works. They could give you all the information up front and then you don't need them anymore.

I was recruited for a flying job in India in the same fashion. I am in the ACASS database and they have called for several opportunities. But all they would tell me up front was the job was in Asia.

Don't smear a legitimate recruiting company based on your lack of knowledge in this area and your unfounded fear.