Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ec51b5a58e2612…

MALICIOUS

PDF

55.3 KB Created: 2021-07-07 06:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9229e5b72ba5febdc2327a04a25f0a87 SHA-1: 9956d2d406f15d60ce94ad21b2a2140418d7333e SHA-256: 87ec51b5a58e261242876ef21229563bc296ecfccf11e443ea9aead1825d131a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution point for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5222

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=marist+college+students PDF link annotation
    • https://bwawarszawa.pl/upload/file/97561501821.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106140518264544.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a933168b6---84608801378.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/vutepazeki.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2f7bd3f4d00e844ee4636f6a7b36b0dd/71469651733.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1dd2edae7787e16ad7c4bad3161aa813/32313621934.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607908fbd4821---10930891746.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbd1l5hu65q8rtq9ul326bb1lj/41193725857.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c949388a553---lamotoz.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d26746539ea---ligezupa.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/73548787384.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d698bb495---67817967738.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/tutotaladupegenowomomew.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed320c46c---vazabewa.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ixevoxuxokilesavuk.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/dename.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/79cbbcfa328d721041143455793dc9e0/xudizibagekekenoto.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8b556011---51704447676.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/81100637325.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/gigibeforufivulexapa.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/semeral.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/tp0e6f6uj4kk330fits19o07et/zunisedevo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4e9e486c1c0d67eb0b0f965804ee029c/bojor.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/71119443906.pdfIn PDF document text

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