ASEOHosting, a provider of SEO-friendly hosting, has issued an advisory about search engine optimization spam attacks.

Per a recent report by security firm Sucuri, 51% of website hacks in 2018 were directly connected to SEO spam campaigns. This attack family is up 7.3% from 2017, making it one of the web’s fastest-growing attack methods. They are also, says the firm, difficult to detect, typically occurring via PHP, database injections, or .htaccess redirects.