Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f878319b9017c4…

MALICIOUS

PDF

64.0 KB Created: 2021-05-15 13:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4244a27631514d91d9a2fdab52f2dca SHA-1: 59805eec6908676e9b74c14ee8fda32f9d61c679 SHA-256: 02f878319b9017c46993a6c03e726e60e196e8e4460e7a842aea6fd68655d86c
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and appears to be junk data, but the presence of multiple links to potentially compromised sites suggests an attempt to redirect users to malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8425

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d0c5f93e---18969133796.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/45fb792c740b38eec52c9be867a59b24/7906210108.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1ad6b53d374d2c4b0d2e537dea570535/30903575219.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/a87ua61o8mg70rhlcahi7uhel0/49481446339.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607345a9ec190---fosodep.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0d26922a901b16030088d946b9409e31/6563705999.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7r24nj65veclr9svfkcvha216/zoxazogebosa.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1ff050d5---97588417757.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2j81ptpvh84hefbpdq0o3so0ru/71322123977.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6mbrvlmb4ss863si0fk5177g43/penorotegumodifavemej.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/424b4d5ba456fe338e66ae9f522e6ed6/54702940471.pdf
    • https://loctra.net/userfiles/file/wodejokoxaduzusedutatej.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c62a6aad0c2aea7976613b7a4e552f39/tibari.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8qg5n8fep873eud1ajvr4cicmn/16728453754.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d382c854---poredos.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bms3okh1to6a17b82u8qkrp5h1/43769027970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=atomic+structure+worksheet+answers+chemistry+if8766
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef52.bin
e4cb9d7e31e1dba0996ef81bfce81d45df632048ca63c893acea5024ff6485d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 5764 bytes

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