Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38c0cdf2449b3d6…

MALICIOUS

PDF

42.1 KB Created: 2021-06-15 15:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 66a90fe515690fbd544fdf9a36d4ff33 SHA-1: 967f44135ce2a348f85246f4322d688a9e9facec SHA-256: f38c0cdf2449b3d6242150b674dd335a68461c3a3263cfee07ab22d8b8ca04c2
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 0.7763

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 42 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://synerhu.ru/uplcv?utm_term=formulas+of+all+chapters+of+maths+class+10 PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5c528117078244ed3f8a9f1c347d9ffa/bigafatafuw.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5f5cdfca---22927246220.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/032o9lq42gsudbbltf463fpia0/35642061323.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/21747322890.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fad74d80528f6c03073dbb0cfd381876/bizupaja.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160790f68e854d---11843760689.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8ffecd0d---42519610626.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3468bd5c---nidemepenin.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/cf35lrmeetqfit8jfc6dn7960t/vowadox.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad8362e6f---doruzawerulopuv.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf361a6a68f---30664906768.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/bimaruvobipe.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b92a4a4f30f9bbbd65b7c63e2cffd842/disodunodujalefovane.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/k9upb08282nbd61vp8897393re/3651756802.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/wumeken.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/dixigilugabulejisera.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/86c71cb9c5f09ab6519dae7128410a86/48338822936.pdfIn PDF document text
    • http://bociany.sk/media/file/bovufowatopu.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/7951704099.pdfIn PDF document text

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