Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d6903cb2258505…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 23:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa59083ceb279a2d222d41537bc30798 SHA-1: 0d476f22f0406d1608f05c095172f6a981b36142 SHA-256: b7d6903cb2258505e00c633f293dc723d5133d86df1260e1a1cbe7b816f6ac75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute traffic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5601

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/tusijopifuzonafulolijowu.pdf In PDF document text
    • https://majubesar.info/contents/files/18831341060.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210902002820.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/kamidafisipolub.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219393026.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/18744541776.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/wojajefikefamonuboparaf.pdfIn PDF document text
    • http://finchamauto.com/pics/gamenasemuduvadov.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210905063823.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/26453391297.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/78412534589.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7f87f1c0ee07fd89e0489aa7e64c096f/kexafixigakojit.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/60946193485.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/mebekuxuzowa.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/mikodeva.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ea051376---vawemoli.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/todirix.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/20783039946.pdfIn PDF document text
    • https://fultoys.com/userfiles/7222177900.pdfIn PDF document text
    • https://everestart.com/images/stories/file/21146186883.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/fudabigubinaruzulek.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133436f72a3f---53025582377.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/44520455807.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/rumobijipumezotibukune.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067686fe54---82434553605.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210904023814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=seo+keyword+analysis+toolsPDF link annotation

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