Malicious PDF — malware analysis report

Static analysis result for SHA-256 f079fe31c33a0542…

MALICIOUS

PDF

64.5 KB Created: 2021-06-22 18:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cd675be0edf699e9034b6beca7c55f6 SHA-1: cd3a414a77e74ff174d49232cb1a9d65db1a611f SHA-256: f079fe31c33a05422a033a3614a09cb855d0edc7d5b9da824b182b015087c7ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qna8np285tdd9cqq83qlnknc9/18261118408.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/79d92b1ce2c24e42747146497d96d11e/wefegowox.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5e32ddc8---pudirezonapekewet.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8e79a54b---31888461237.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92a1f33f4---lufujujamofa.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6d6cf2071ec7736336dbda6e25925793/122898164.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/db28b9409f7ef8201690dad85e2590f5/munofiromusapesikozimu.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47707d509---mobof.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db345ce9a5---12575093110.pdf
    • https://avonsteel.com/UserFiles/file/59208469384.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/tm2mh1qt8rp7c39omr53l17et2/77331506773.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ls4enn7bf4ha8r4atqrgjn3ms6/48823443678.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/80852056510.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6cc0e76658ed3c224b1f949b44da49e1/83133923015.pdf
    • http://interel-rus.ru/test/sites/default/files/file/miluraxavalisezifax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=maulana+abdul+karim+parekh+quran+translation+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b117.bin
5ff6b92409db90ee3f0b6b46c47d3f2ec84612f85d24fd8755b878b3e021d96d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 5496 bytes
font_01_sfnt_off0000c390.bin
37b16156903d88770f338b63addc069a26ff8b277cece1540c8583482f99947d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 10296 bytes
font_02_sfnt_off0000e69a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 4324 bytes