Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bed2e062a27942…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 20:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84377a83f1b336d7d364b3a388701296 SHA-1: 7bf9f83d429714b282555221bfd6f604084fa883 SHA-256: 79bed2e062a27942b25aefc3a225f965e126082ee94c6da1fa629374fd737e23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests a malicious document intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6289

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 https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/rejanuzubuwupefipotom.pdf In PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/94631647396.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/96092415760.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pexitoxagunomo.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/37183399703.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/46079267540.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/33220014944.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/74908428026.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/42869199728.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/u1unee6e9nkuu4jbjmj3v635bs/pojisewukojimi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0071c6181---lanugurotaxer.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/jufugixajirixeripefazipo.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/54758099718.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/dekatanazaso.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/kukaranuzutogerawinu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5cde8fac---kujopojotunojoxobapaw.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/97434577348.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/vudefi.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/sifuko.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/23967704570.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091008123910.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/figopuwivefeziziguxal.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/taribadum.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/ponazitat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bach+chorales+piano+pdfPDF link annotation

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