Watch Out: some “free” PDF converters are just malware in disguise

Sometimes you just need to turn a file into a PDF and move on with your life. But lately, sketchy fake PDF converters are making that harder — and riskier — than it should be.

According to a new report, attackers are planting fake PDF tools that look legit at first glance but actually infect your device with malware.

Once installed, these sneaky programs can steal your personal data, financial info, passwords, or even draft you into a full-blown botnet without asking nicely.

The Report

CloudSEK’s Security Research team launched an investigation after an FBI alert warned that malicious online file converters were being used to spread malware.

They uncovered a sophisticated attack where a fake PDF-to-DOCX converter, impersonating pdfcandy.com, tricks users into downloading Arechclient2 malware, part of the SectopRAT family.

The report breaks down the technical details, red flags to watch for, and offers practical tips to help users and organizations stay protected.

The Takeaway

It’s a classic case of too good to be true. A sleek button that promises “Download Free PDF Converter” can turn into a whole mess if you’re not careful.

These malware-loaded converters are popping up across unofficial websites and shady ads, usually targeting people who are just trying to handle a quick file job without paying for Adobe or remembering their Google Drive password.

Here’s the good news: it’s actually pretty easy to dodge the danger if you know what to look for.

First, skip the random downloads and stick to official app stores or reputable web apps you already trust. If a site looks like it was designed during the MySpace era, maybe don’t bet your personal info on it.

Also, keep your antivirus software updated — it’s not just for your parents anymore.

At the end of the day, converting a file shouldn’t cost you your identity. Keep it clean, keep it official, and maybe double-check that link before you click.