Ist go4up.com sicher?

Site is totally safe for as long as you know what you're doing. I do not recommend sharing the links with casual users though. Clicking anywhere may cause random pop-up ads that can potentially redirect you to scam or infected sites. You just need to be careful. I've been using the site for more than 2 years now for uploading and leeching files, and I would say that it had never failed me. Use an adblocker with element blocking tools (along with additional userscripts plus pop-up blocker) for convenience.

This site purports to upload a file to multiple hosts, but when you go to try and download the files, it tries to send you malware. One link in particular I clicked on locked me in the browser window where I couldn't escape without hitting CRTL+ALT+DEL to open task manager and manually close it. A voice kept repeating "Click add button to install extension" and my Malwarebytes and Webroot Anti-virus was going crazy trying to stop the connection and block forced downloads I didn't click to download. This site is definitely malicious and does not work as advertised. It simply claims to upload a file to multiple sites, but when you try and download any of them, it will just attempt to install a virus/adware/malware on your system. AVOID THIS SITE AT ALL COSTS.