Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f79a4056e6241a3…

MALICIOUS

PDF

38.9 KB Created: 2021-09-27 23:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 574c16302738e951dd2fca74325bb3f0 SHA-1: aad4306670d02badcb60fb626bae2ad3ac981afa SHA-256: 9f79a4056e6241a329d184baa8f95eff1e83462bc128b0dfd5ab87699e229b3b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories. The heuristics indicate it's an image-only lure designed to trick users into clicking through to malicious sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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 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://crysiq.ru/uplcv?utm_term=spybot+android+free+download PDF link annotation
    • http://naturalmis.com/userfiles/file/juvipebitonubobudolozasos.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/tipugizotezevakal.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3ab82567234e90efa5c1969a53c3563e/bisenajazemaromifi.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/43329998119.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/51802715973.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/wewubepitusi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cc367ba3---98964440828.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/bbcf162c19d08e610291d0c3dfeeef32/kobadunawowalekatetodu.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/nusokuwuminevuxod.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6083e10d---30795873373.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcd551a6a---66409211004.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/97780501897.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/1105651156.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/somofofarusugepep.pdfIn PDF document text
    • http://idroter.org/userfiles/files/73566306143.pdfIn PDF document text
    • http://www.samuitns.cIn PDF document text

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