Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f87603771a738f2…

MALICIOUS

PDF

45.6 KB Created: 2021-09-17 10:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2be4dcde8f22f22387c5bae4d3dd567 SHA-1: 4c667f523b8931485721efa2d5dbc93ca835eb04 SHA-256: 1f87603771a738f2b673e016f29ff2e6e10a465a64e6f917cc5ce203a49ec7b2
154 Risk Score

Malware Insights

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

The sample is a PDF that functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, as indicated by the ClamAV detection and ML classifier. The PDF's structure and embedded links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9245

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8babd871---18965110843.pdf In PDF document text
    • http://doubles301.jp/files/ckeditor/files/wipiron.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d89f701f3e149c75528ff959f7cca7e1/gagefugefuwi.pdfIn PDF document text
    • http://kahasat.cz/data/file/64809788285.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fivotusomatavesev.pdfIn PDF document text
    • http://pk.mo/userfiles/file/74278068938.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/26dccdeb1144bf7a12fd8bf0b2f6e5a2/befidon.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f8263408---fupobitowemumetegemo.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/levosenuradapelutek.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/nanokexib.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/nilako.pdfIn PDF document text
    • http://xtra360.net/campannas/file/tegupawosunerax.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/87319467215.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613b9fc5e0f93.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/kafagetopatodelig.pdfIn PDF document text
    • https://maria-galland.ru/files/file/1065921245.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/wiloxekujoxi.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/lepebuzagunabefukuwokopid.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/60508184296.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/90762780734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dash+tag+android+downloadPDF link annotation

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