Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a39c9ef110daa9…

MALICIOUS

PDF

501.0 KB Created: 2021-06-20 11:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 276695b5fb22d2f5af865f3d783e1a2b SHA-1: c1dda9830f0d45411b89b6815814544c7641e9d7 SHA-256: b2a39c9ef110daa9d957f9060a10969e445e225f967f8b637ba38cab5626e93d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8829

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.
  • 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://kzlo.pl/fotki/fotki/file/61169100899.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab2359d25---43495661041.pdf
    • http://steakclubhn.com/campannas/file/lusaduxuxofewibaw.pdf
    • http://zhengfutz.com/v15/Upload/file/2021631555288205.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5df02074---ruvepokinarawa.pdf
    • http://forglass.sk/userfiles/file/lileg.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e8d794840e8de4b5de9814fe97cfa569/32912020643.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/25704275247.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/13788072616.pdf
    • http://china-miyaco.com/img/file/202152942946.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/2139de0d6285d456a03bbe6e5248548f/7442870164.pdf
    • https://burstallconrad.com/editor_files/file/86326792517.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9e0a64d7dbe9f6e5370f0a7493d8a6d2/vixasojusegopezunaguv.pdf
    • http://alpha-th.com/userfiles/file/midezokovude.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/07jkji9846uj11gpvhcou5c0ea/58506910107.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=desire+of+ages+chapter+9+summary
    • 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_off00078bb1.bin
b2b835745bb7d1ca40bd5d697e8365fd01b53f873a088b801a963ac5736253bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BB1 5652 bytes
font_01_sfnt_off00079eda.bin
71aaf03177a1610d19c32c729a9a37c11d7d342ada8a27b5d8302057fa9e004f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EDA 10596 bytes

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