I have gone through this code and I'll be explaining what it does below:

Upon startup, the plugin creates a hologram named "§0Welcome to CrxzyServer" at world, -20.484, 75.00, -198.

It creates another hologram named "§cYou have 3 Lifes, once you used them, you are put into Spectator" at world, -20.484, 74.0, -198.0.

yet again, another hologram named "§bmore things will be added soon..." at world, -20.484, 73.0, -198.0.

Those holograms are not visible but you might be able to see them if you would go to spectator mode. and all those holograms are cached into the server's ram.

When it shutdowns, it'd remove the holograms from the server.

Hello! This plugin is NOT malware I have checked and scanned the file. But I I have no idea what this plugin is.

No descriptions, extremly small, probably a virus or something to steal your infos nothing else