Is the money that a person obtains in exchange for signing car rental license papers, without actually managing the agency, and in violation of a law that requires his permanent presence therein, legitimate or not?

It is not permissible for you to be an agency manager and receive a salary or commission merely for signing without performing any work, as this violates laws, and because what you take falls under the category of payment for illicit influence, unless it entails effort, hardship, or expenditure of money. What you have previously taken merely for influence must be disposed of by spending it on the welfare of Muslims or the poor and needy. One should be cautious of doubtful matters.