Salam Brother Samir,
Get ready to add some plugins.
1.Sucuri Security - SiteCheck Malware Scanner: Activate*
If the scan shows positive then add this plugin:
2.Anti-Malwareby ELI (Get Off Malicious Scripts) ... Scan your Site.
Your gonna have to update definitions then do a complete scan.
If it shows anything live other then a possible threat. DO NOT EDIT UNLESS YOU KNOW WHAT YOUR DOING. ( research further...)
If your site is clean after running Sucuri Security and your still showing linked spam then you would have to go in manually.
Open up Notepad and copy and paste every web address that's infested and linked on to your site to block their IP Address's off your website. To get there IP address's Go to websiteipaddress.com After you retrieved their IP's copy and paste unto Notepad.Block and Ban each one Manually by installing these 2 Plugins.
3.Better WP Security and Wordfence Security Install and Activate.
After manually banning and blocking these Ip's your site should have no or less garbage.These 2 plugins are highly powerful you will understand them as soon as you install these plugins.
I would also recommend to remove right click on your website by adding 3 Plugins: CopyRightPro,No Right Click Images Plugin and WP Content Copy Protection.
I would also highly recommend a fire wall.
4.OSE Firewall. Install and Activate.
Don't forget to make a Dua for me :) Thanks Wa Salam...