In order to prevent this type of mischief, network enabled printers should never be connected to the Internet. Allowing them to do so only allows malicious actors to send any type of print document to your network, including pornography that could land you in trouble. […]
Article Link: https://www.bleepingcomputer.com/news/security/printeradvertisingcom-spam-service-claims-it-can-print-anywhere/