Malicious PDF — malware analysis report

Static analysis result for SHA-256 351f9ce69fc10e26…

MALICIOUS

PDF

41.7 KB Created: 2021-06-11 21:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8c985aeec9b9e55f97785a005017b774 SHA-1: 5d788f93905bd07b97a19987570011d123999d1e SHA-256: 351f9ce69fc10e26f0deec1d5c145a2f02ff8897b3954a7642398765492ee1b7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV flagging it as a phishing trojan. The document appears to be an image-only lure, typical of phishing campaigns, designed to trick users into clicking embedded links. The numerous external URIs point to compromised CMS uploads and disposable hosting, suggesting a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8038

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 41 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://infrive.ru/uplcv?utm_term=croquis+fashion+drawing PDF link annotation
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/eab8d98a4666a2bf012f8f25b5cc0d95/90426099456.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2795e1ee84---bidemogoxaxu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/66439927794.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e2729b9bc7945645383b7c2f4ea3be64/47721941032.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/dovupuvukevabosurop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s23uv0kobntq5guu46vo2ceri1/40686032191.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0038c4971f---19633149014.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6db26846396f6fbded05c8b1fb56552a/21730176739.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/90064682041.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/monezatupudewejexixuxoki.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f6f6ac3f2471fb890690e8368a2ee2d6/10007960830.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8295df7f---sovetedixisenigudo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/u0q4jeknosui9bvo8rugr0h4sg/vowefonexexewozuwisik.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8d05918cbd26bde74fb60b198f8dd323/puzigitufufiviru.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/nivilazagukefafaxebup.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fjsdk9gguug5obg352arnomah9/6632824347.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h649h0i42he2j4pjm9omlvfkj8/pifagexuro.pdfIn PDF document text

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