Malicious PDF — malware analysis report

Static analysis result for SHA-256 d844a9b743e84e2b…

MALICIOUS

PDF

39.1 KB Created: 2021-09-03 01:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 62b6518ce5e372583cc14e24d061a367 SHA-1: 7e5cb1329a120570432b462b9ef2926aba617304 SHA-256: d844a9b743e84e2b122dcc7730409dc2d937d2bc886a9232a1f6fc1f6b02627d
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 0.8579

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 39 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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37059248d1---zanujixa.pdf In PDF document text
    • http://dokumsuzgec.com/userfiles/files/12045220271.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0889803005cc9409daaca275ac40eb98/rapemewilolixedawado.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/dopofojak.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/bewexefisukoxaj.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zuregisitixixevelib.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/kevagodogugikunow.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/djribenvgpeh0crsfnaq4pji69/bupimarukoberuzi.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mexatixawujekuxovulilu.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/14366908438.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2e17d07cc---zisuvatalejukus.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/80542646664.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bibaw.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/3778247951.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qiutivldc9n162h4l9nac4tuus/vonotix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=math+first+grade+worksheets+word+problemsPDF link annotation

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