Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0d822567146363…

MALICIOUS

PDF

73.5 KB Created: 2021-08-09 12:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5a919ec6f27d69ba6a360b9db6cbe956 SHA-1: e681503be1afb73e1f310fda75396be978dde2d2 SHA-256: aa0d822567146363d7be4f5d0d0066b15a51530c6001af597f7cc6887a74a2db
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, indicating a potential phishing or SEO manipulation scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7770

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 https://assignmentmart.com/ckfinder/userfiles/files/bomewitijorovevuguxig.pdf In PDF document text
    • http://meta-min.com/files/lefuwamimovovimomapoxovo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d88956eb7088acea593aad580e80749c/papewifubo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1b93889116ee97e7cfde866d5751666a/tomekoxod.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a55be695d---43110590243.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/modokisiwopifel.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d42aa39b11---11640121978.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060104535573499.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71519354f---durufejatopir.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cec4c92eb949d7e4b1c99a7921dbbab0/22989521683.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afebd69a8b---nanejowebo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c727b73496---89367719609.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/56210283785.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0300u3lh94n0dhummmj5iuku9i/xufabedubewuxo.pdfIn PDF document text
    • http://wenxuezj.com/images/File/fekesakafukuzi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb601beef---60578448288.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/paxufubuda.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/larubebojenogivo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f4072a4b---futilajeju.pdfIn PDF document text
    • http://axwelindia.com/uploads/61110070531.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/50618637524.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/96965970567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tester+regulateur+pression+pompe+hp+1.5+dciPDF link annotation

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