Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d3a2bc2f9930b9…

MALICIOUS

PDF

40.7 KB Created: 2021-06-25 19:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: e58d437e63a8b8c60ae6310128ce372e SHA-1: d83e6f748449a8a5004ae89518c83986156bc67b SHA-256: c8d3a2bc2f9930b99a98c745d9ea00bf8aae1d7f5129eb42aec44fb683350519
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8553

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://daiichilogistics.com/uploads/news_file/6379597232.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2f2289f2fa3b085da9709305734aba99/60970867926.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cce0e1bfe---62552486497.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aed75a9bb74---71474680489.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b67c62948---tiritevalurijujare.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/84fdc7395b418863c288b17bfab7a394/32213605664.pdfIn PDF document text
    • https://limmaginebistrot.com/file/51343259991.pdfIn PDF document text
    • http://elm3rad.comfile/611999451.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/37727094111.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4b8a331733a1662ab2c5d2958c4204e3/81021762595.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/torijebukikaluzo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/74md9su549p6r9m88foi205i54/minanuvurogivigiva.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/48b8ed477a4abb49922cdaabc0e7b50e/nepolegedewogaxima.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0e1f7283157e777a22778bd68761b2a2/gixuzum.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/74393768410.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/finusevapo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7393230370db1523bd1454562a9cd7d0/66584852743.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/tanirizidobinaz.pdfIn PDF document text
    • https://aokman-drive.com/d/files/walajibo.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/74052573721.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/476a60836ca1b0f198162d0c6e64dd78/wapusifozo.pdfIn PDF document text
    • http://ridendo.cz/files/file/fokiwit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=asynchronous+and+synchronous+transmission+pdfPDF link annotation

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