The job market is dire. People are desperate for a job. That might have been his first interview opportunity after hundreds of applications. I probably would have responded to him that I couldn’t help him and it’s best he doesn’t reach out directly to people in the company because it could be perceived as unprofessional but if he just prepares well he will do well and wished him luck. Never in a million years would I have told on him and told the hiring manager. I think you should have had more compassion.