Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcf15867518673b…

MALICIOUS

PDF

63.6 KB Created: 2021-06-24 02:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a6554249476f7c82b7177756875c382 SHA-1: f7a3cf25ce5330c0f45c75af028feb1b2405d590 SHA-256: 9bcf15867518673bc3cf8fc1b17e94184d8e02291bbf41ff46c62672b5a7f7c3
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

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://weddingitaly.jp/images/file/91474626150.pdf
    • http://laiyi-art.com/userfiles/file/50206239245.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef58af0e32---kajogosa.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b213a2e0c---46563986305.pdf
    • https://groupburuemas1.com/contents//files/rixapaxemixixurej.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ad76ddad---mavosud.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/zaruxefewalimov.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/nututezobukopekavutokekat.pdf
    • https://didacostruzioni.it/userfiles/file/32463064779.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/lb912jqo2s1kmfu99jn7nhdqsk/57079653479.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26ef05c729---nobimapixesodeket.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea55ae6647---5234882114.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/rd62f5mj59ptepnpdau265tfsl/vugab.pdf
    • https://ajitcoatings.com/uploads/47988821655.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d9c19e33---xipekase.pdf
    • https://egf.tw/test2/images/file/rebivimenepebumomodi.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e15f44178b2cb5690c56c2cfd4d2128e/1945222897.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+kitna+chahne+lage+hum
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc55.bin
8f5bf3093775c803f54c25bb28b05e6e188d773b701b966a38c9f9cad9dd9d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 4952 bytes

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