Malicious PDF — malware analysis report

Static analysis result for SHA-256 d271ca5bdcac165f…

MALICIOUS

PDF

62.3 KB Created: 2021-08-12 10:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1cb21d7556f9711cfbdf42b967efab1f SHA-1: 3fd120a8088899a5dfb7bcad10379e23c20fa998 SHA-256: d271ca5bdcac165f11db446d0b6a5e07a2e066d21f8831be7acb583c18b9c0e0
94 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to redirect users to potentially harmful content hosted on these sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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 http://vorne-sitzen.eu/pcms/content/file/gokirubugofetabavux.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7c2046a0e9105a5d002936577f555025/953289098.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/85428297137.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949052a859f---27345747775.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3735e9ce---4313672965.pdfIn PDF document text
    • http://indemo.pl/Image/files/wumiximolinukalo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/17669763043.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5a41d985---ribitobisumikid.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/dujuralasur.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/19109617732.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/xaworaxugutuwimipoxenise.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/saxegibuj.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/vepitokimolositaget.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/27a94d4e6ea1b50011311970cc661a3c/zelutuz.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c967935e36a---tobotaromaseleno.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/biwidumunilu.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/77279156541.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f07dab57e1b---65164724505.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/50695552285.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/34947652206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=brown+v+board+of+education+historical+significancePDF link annotation

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