Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1cdfda573e5f55…

MALICIOUS

PDF

47.6 KB Created: 2021-10-02 15:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd343f0d50ab127b459294d5e9926b9c SHA-1: 4b989cff3200ea794ac2f0a25a5a9bd0edd10f40 SHA-256: 5f1cdfda573e5f55ee007950fb0fa01dc2b7ea513e7c82cc5cdb089083d15ec8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple websites, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to lead users to phishing sites. The document body is unreadable due to encoding issues, but the heuristics and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7448

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 http://www.veslovani-vsb.cz/soubory/file/zipakokofox.pdf In PDF document text
    • http://villabrown.it/userfiles/files/wuxorifiwavonalixura.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/80046335668.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/518b6a8409358a763f47d9fcbde23905/51153550094.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/88885755106.pdfIn PDF document text
    • http://refmexgl.com/web/uploads/assets/userfiles/file/winabevitugodiwerifez.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taloxavebek.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/mezibiwisidafekewelevuziw.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/81759339920.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/bugogupijik.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/besezazezaminazi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/dagetovikawipagoje.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/gakuwutilo.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907234552_g171zt.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/79283353541.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161342812d07fc---9495321790.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109231827021621.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/73464949845.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/69940706328.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/dedowibo.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210926065950200.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdc1d59ee---duvatuvibofosin.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/jowub.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef416b921---nekewemodeneguvafimixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=small+business+seo+solutionsPDF link annotation

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