Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc332849068aa702…

MALICIOUS

PDF

39.0 KB Created: 2021-09-08 00:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e969d83ecb866fbb9ccf38fca3116e38 SHA-1: be50ed148b9979012830d80cf1115662c461240e SHA-256: cc332849068aa70286c486f8fba90dcec64d321f18cb9ca24e44bb294fb693f6
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various external domains, many of which appear to be compromised or disposable hosting. ClamAV detection and ML classification confirm its malicious nature, likely serving as a dropper or redirector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 39 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.
  • 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://archism.ru/uplcv?utm_term=factors+affecting+customer+satisfaction+pdf PDF link annotation
    • https://kompaspt1.com/contents//files/74335550385.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/4709055132.pdfIn PDF document text
    • http://chromatographvials.com/d/files/katuk.pdfIn PDF document text
    • http://imaginove.eu/data/Files/22053555045.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/41949244607.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4ea5afba---70552122448.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/vovemopozexerob.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/990gtv6v4it28ggg4tb7janis1/bazufo.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/zirokaji.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/22424952809.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jcssa2p17s8i2lj4lv5a1tau55/kimulitevigaxuvi.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/15788302046.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/lodudawovumososajavugebez.pdfIn PDF document text
    • http://www.moyekolodin.com/files/34926235798.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/92668084479.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lejixozapemivawajagusevun.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/pozowojawarazaxuzaxinivi.pdfIn PDF document text

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