Malicious PDF — malware analysis report

Static analysis result for SHA-256 a153d2f309f9cfb7…

MALICIOUS

PDF

38.8 KB Created: 2021-06-12 21:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2773881dce9c8a9d9a4b0c5839f64c9f SHA-1: 9089b576fed2ded0ee2f1e4d343a21aa98e6744d SHA-256: a153d2f309f9cfb7ed8595bf949c1e550cbbf20d138b6fb4624861980266a6c5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 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 0.7264

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=gamecube+wii+roms PDF link annotation
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ftsg6m8fjev8vfl1ons07n2unu/borobatowirudutoro.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c25d96b0c68---6843763539.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160849c9a51d0f---tiwewetisakixododudugod.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c4b076bdcaeaf9601ae9c706eec7a114/poroverowafulat.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/347e8e3d695d805e60f5233b99238486/mavapavamikepe.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/loa39git7pan6r17jhqreegvb0/1699289921.pdfIn PDF document text
    • https://latework.cz/soubory/ligukazes.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac735187253---gutopedovarazuxegudopeva.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76ec013c3---vejewepitufazezepa.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/45522451849.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/43416663171.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c369d4a4---wipafezuxobin.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-foIn PDF document text

Related samples 8

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