Being careful about the sources of third-party content will reduce the chances of malicious redirects. Using HTTPS for all pages will prevent MITM attacks that redirect pages. Beyond that, the remedies are website security measures that will prevent and disable malware in general.
The administrative account should have a strong password that is well protected. Accounts for contributing and editing content should have only the privileges needed to do the job. Software should be regularly updated with security patches, and the network firewall should limit access to services.
For strong website protection, sign up for Quttera ThreatSign
. It scans for malware and removes it, as well as providing a web application firewall and other tools for website security. With ThreatSign protecting your site, your visitors will see the pages they should see and have a safe experience for as long as they visit.