Malicious PDF — malware analysis report

Static analysis result for SHA-256 1681e3b080a87ac2…

MALICIOUS

PDF

88.8 KB Created: 2021-07-13 13:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17fcf73a22567b1870f21927367dae89 SHA-1: dc5f4638e15fa619a6e8e4d8086c6e0350a9fbc1 SHA-256: 1681e3b080a87ac2de45b4db06b4116327d80e2085d48bdfb2d7ad09e10b52e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7167

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9292b9779c77da54325036c588bcdd8e/tadunaw.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67cf0f95d---56241598117.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lowejabe.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dmp7u7ft9dlnjm4ir1vntjoptb/44677426732.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4307460e7---97077392882.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/03861cfa1904ff47d9038d32b96a4d14/gufaferuliveduzobademazur.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7015c4cf6419ffe4e65faf17f7582af8/70019668006.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1i5g231b44vttfl807geml7o4j/guzudeguvuxu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/16760562218.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/sufajunelidago.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/57ed8401a1fd73d6771080b543f54ec8/56480410901.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/58009234110.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/voguregefoxosefe.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/komaxovijaxeboduxeb.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5a04e6dea2098796560426010d1e99d1/potazinitusi.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/9949901479.pdfIn PDF document text
    • http://foodchemsino.com/d/files/pitibivemebunikasos.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f3989945---tevidabujikepenesilugev.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/51ulkgf51rknh756prllkq9k7o/92727024928.pdfIn PDF document text
    • http://dentali.cz/files/files/73052777090.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/wotemixivazaniguwakulas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=happy+birthday+dad+quotes+from+sonPDF link annotation

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