Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b3a705d0cb7d44…

MALICIOUS

PDF

63.7 KB Created: 2021-09-06 20:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f834a4d137f80970da49f8a36b6fdb2 SHA-1: 449d94ca14ac4e69f6d17432f100f56813a49d46 SHA-256: 24b3a705d0cb7d442ffd206a1f85e9a0f82661e6edb84b75352d0f6b928fe091
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5245

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a692ed0e25f---61183076206.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c940cfbb---vigivepibudalerawujazugu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/pakujinaxutik.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36351738f---23664304459.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/32175840118.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/rited.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lqlqq2juer20d77uvo60eudra5/65844980596.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/xesorelasakevafod.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0602b71e---tekafesixevowi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cbf98021e0---28054179150.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e089c608d32---43823492717.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1084a65b1---sonikizorapavajun.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/5654615072.pdfIn PDF document text
    • https://davnosti.ru/upload/54650053001.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/90372195955.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/153818d36b781fa04b31c7100adeb305/87082775439.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/58891095464.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/81322499595.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1658003532612d330fd8755.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/kiboxesivuzagevagiv.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b403suucgjvdh9ovv8k1ke1r1/95580762413.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e65e172b4---pefuremegewedegefetukal.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/mowowomevagiwebogexexoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+java+open+pdf+filePDF link annotation

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