Malicious PDF — malware analysis report

Static analysis result for SHA-256 289944a7e7c4e925…

MALICIOUS

PDF

38.2 KB Created: 2021-07-14 02:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 8d2cc33e108c3c3a0040adb5b341c8d3 SHA-1: df7b2e3d3784cb9b7847d75d264f9efd870a0b84 SHA-256: 289944a7e7c4e9257b21857bd3e23da5bc30263785e58e2dc62347d6cd6c4bd1
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged as malicious by 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 0.7779

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=emphysema+affects+what+body+system PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vn4sejr6qof7vel59d2h6ne3lh/baxopelugujedipum.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3718b74ce---nojusezugegotunexa.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/93902eec8f56ccc82883a94e6fe7fbed/turexaperiparigodefapat.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96ba4f824---powoboxasezonujuvapowaruw.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/95a384c8d7ddf883f720e33be794f806/pivozepelasig.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wagesopasokenika.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d216dee5---savupes.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0389bdfa5a4d9c2c2ac1780a3c9ad580/92183889727.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/subaxevi.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/8994155500.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/koroseruvenavowinuvub.pdfIn PDF document text

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