Calculate the aggregate amount of time candidates spent on applying the ghost job and use the job's purported rate of pay to calculate the amount of money the company stole from the public. Was it enough to be felony theft? The person posting, or whoever instructed it to be posted, gets charged the same as if they stole that amount from a till. Instant end of ghost job postings as most wouldn't even try to find the loopholes and edge cases when prison is a risk for getting a workaround wrong.

Sending people to prison seems like a great way to get no jobs posted.

Fraud seems like a more direct issue.