Malicious PDF — malware analysis report

Static analysis result for SHA-256 9378638abcbadb20…

MALICIOUS

PDF

48.0 KB Created: 2021-07-19 15:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f5419e8edb5db67f70daedc6a3ab890f SHA-1: 6f12d98be3658f38041df0ca55b64c6d06b64a03 SHA-256: 9378638abcbadb20a6631106585713e3c666f43d6022cd1cf948c7390046f02e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised or disposable domains, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7378

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://yangs-ns.com/ckfinder/userfiles/files/20210528133737.pdf In PDF document text
    • https://proia.bg/userfiles/file/vuridofekezib.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bf46e3b8---10349840922.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lmgnu1uve9c60rn9lce1qkjo57/69477036616.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081783d58839---bedelifajovokojuvar.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6s7peuj2228fiabn12nfu0ee43/97010233632.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/muvidolitekutumunadu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mli208j95gon8et6ugt9n2uofk/27546434738.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224ba3858f---47371217525.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/pvr5ajtq8qe931as54dn8jsh1b/68585131662.pdfIn PDF document text
    • https://polandpools.com/contents//files/midigelilajadukuf.pdfIn PDF document text
    • https://codecs.roimages/file/51700342290.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/8736341411.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/44402488499.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/pujetuzakefemob.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d2a9b9bc132f22d1aad800d2d407b893/fubofeleneloxo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/77655e8bf70f8aec43213beaf000ca17/rafudurelezopanaxetesitap.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b1cc55dfb---leforivipevokazizikufenu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0d36df45f---wulanerazuv.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/16127477785.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/47990075411.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xamadipeluvid.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/27265464058.pdfIn PDF document text
    • https://digireg.es/upload/10192750892.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e33cc85687---murubadasepedorevijufuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+most+famous+photographPDF link annotation

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