Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ea373965aab33a…

MALICIOUS

PDF

62.0 KB Created: 2021-06-20 20:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 908c5d0e233674432d314dc9ce2897a6 SHA-1: de8bc568c6da244c02638d5d0c04ee98f828b125 SHA-256: e5ea373965aab33a2f934bb021cfab59939d9e537b982147279b364e3497abf6
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload directories, suggesting it is used to distribute further malicious content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/15275090c8d4c37eda61c63c735d552b/fonolozedukuvifazufu.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lak2qh1jv21n023p95uq7mgrp7/40199246002.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3b70304fd7878aaca513bacf22178e02/dedum.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8349cd63---68586122859.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35377963fb---59659286470.pdf
    • http://sarlampa.ru/upload_picture/ligivujowudakivaze.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cca475c294a---71332330131.pdf
    • http://sotel-perm.ru/site/file/74782136786.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/21016473434.pdf
    • https://hoakhanh.vn/uploads/image/files/fubonulinulokusitur.pdf
    • http://katachizu.com/img/news/files/kipesixun.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78189df473---solilerabopenixukeweju.pdf
    • http://lyshiying.com/d/files/zuvepujaleluvodebabapu.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43a680298---vuforelegamamuloki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=anne+burrell+topless
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6e4.bin
dd3b54a529369a3faf93ce2ccc570347ea0e3610b98fd13a2f87693a2092d290		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E4 4732 bytes
font_01_sfnt_off0000c704.bin
b4381e600e2737bd0ca59a4b969b4195f5bc029672b448aae685a379c6e14bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 10780 bytes

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