Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d32b7bf3a6b3ce…

MALICIOUS

PDF

38.9 KB Created: 2021-09-18 04:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f73c29284bdb68741464e232ec1af226 SHA-1: 4916de2d04c5009c832e29a2940add8e25df0731 SHA-256: 91d32b7bf3a6b3ce132d8d53234e7bf6ceb3312a2a7d83b7d2b8df9dba4c9be4
182 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, including ClamAV's Pdf.Phishing.Trojan detection. It employs a common phishing tactic by presenting a screenshot as a lure, with a hidden clickable action to redirect users to external URLs. The embedded JavaScript stream and the numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest the document is designed to lead users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

Heuristics 7

  • 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 38 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 https://catamma.ru/uplcv?utm_term=google+map+android+tutorial PDF link annotation
    • https://whitesal.com/data/images/file/2861_20210916162201.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/7118732951.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/tulomupizunepogo.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202199203633404.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/8605278232.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6e5b9c3l34kck09ap7a600th7e/39985139508.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21653a594---putin.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/mekine.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335cebbf0da---73127554674.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/38423446646.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/pijixuguvorom.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f02487602---3106932690.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/44631757715.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/75142809569.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/51258571798.pdfIn PDF document text

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