Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f69da726557a9b…

MALICIOUS

PDF

132.8 KB Created: 2021-10-12 10:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a71177287c267c7da0041e65327d419 SHA-1: f0fdd76031328d52d9d32370f8dfc97e0897985c SHA-256: 72f69da726557a9b768952df3ad2dde22a5ae47d596f47c1eaedb67aff59c176
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to external sites, with several heuristics indicating a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure suggests an attempt to lure users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9397

Heuristics 4

  • 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://www.ksmt.edu.np/assets/ckfinder/userfiles/files/musegixesa.pdf In PDF document text
    • http://greenhere.cn/upload/ckimg/files/202110101212268039.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/nimudibezilaze.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20211006075138.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/negad.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wolegizik.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/5698250534.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/jinufamoturijupewexidiwo.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/66791997830.pdfIn PDF document text
    • https://bnovum.hu/downloads/63203416560.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/21674688767.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/264d7ada98cddd7e6fd41162f1e474e9/59838282030.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/58859730098.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/93765763855.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/wobixo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qi13s9qisuv1fovcb15rlhjmve/99442106954.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615348c934218---53387653092.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/fuvikinef.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/88103734017.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/46365158789.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/naxanowulipefos.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/23130864218.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=right+from+the+word+goPDF link annotation

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