At the end of the day, the responsibility of ensuring that the company you are working with is a genuine company and everything that it says about itself is true falls on the shoulders of your company. If at a later stage there are some legal and integrity issues that crop up with respect to this associate company of yours. You could be held responsible for the same as well. You will not be allowed to plead ignorance about this aspect of the other company. Hence, it becomes necessary that before, you join the name of your company with some other company, in any form, you should do thorough company validation check on the same.