Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c8ad70a45dda2f…

MALICIOUS

PDF

67.9 KB Created: 2021-06-28 14:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 471c134ed4e3ad0a53f4d32e094d27e5 SHA-1: f802469fb617757b2fac37b3693d130b3d7a9c88 SHA-256: c3c8ad70a45dda2fa104f0ec591d86195e1e098d4f8b89ed42e55954ab99b308
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to compromised CMS upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5526

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://bizbecho.com/pa/trainstation/uploads/image/file/loxatesixunubar.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/717d2120f886325fc2b097cb8d1777ea/gabunokuxovijiwo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070261b9a5ea---24308698128.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d0799857ce6633bad1785e934f432903/5417856149.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e0c335f7f5125b2a197b088919d01786/merimab.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429174542475431.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/putepi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f4aeec6a464218c3f7fe8f8706341209/tutowugarelomeziviworilif.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/11509804056.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/sogepalexoviposinu.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/bemokadaxonixudagevuxe.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160894e8c2a546---98018834718.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/luwel.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/kozipivatuzi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/dizozexapafu.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/berada.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ff662d98a003b92bf2f60f734a539635/wafopezegexunugomigebabe.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d4745c20d29619e3b5f61f9ebfeefa6f/24707203564.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd2b37735---fiboxabi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a354fca5d62---rilodumi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096a6ce658c9---3717284591.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/kofawijalomulid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=to+be+regarded+as+an+unknownPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9eea8504c---gobagejegid.pdfIn PDF document text

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