@maria858 The malware is installed in the fifteen theme: http://i.imgur.com/VGVWzE3.png
I high recommend you to remove the entire theme folder: /wp-content/themes/fifteen/
I would also recommend to rename your plugins folder : /wp-content/plugins TO /wp-content/plugins-old and create an empty plugins folder and start installing the plugins fresh again from the wordpress plugins search directory.
Finally, check your main theme js files for a malware that is exactly like this: http://pastebin.com/jEg9EbYM
In case you find your js infected with that code simply remove that chunk of code and you are done.
After you have all this, request a new scan in quttera. If there is no malware congrats, but now you need to tell google that you have removed the malware, and to do that is quite simple, follow the steps: https://support.google.com/webmasters/answer/168328?hl=en
GL