Malicious PDF — malware analysis report

Static analysis result for SHA-256 189d8f08d2d1c601…

MALICIOUS

PDF

81.3 KB Created: 2021-06-03 12:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55ae81ba8f8da5f728f276b489836b1a SHA-1: 51a1db1c878e2a2bcad21d043746355e0f3a9fb9 SHA-256: 189d8f08d2d1c601bd4edc27713bcd4456bdfd088fda9a382a1f556d47720e5c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160977ef78c66e---78493238375.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/32eb19f240528e15685fd7be2d223576/23458077070.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d2982fc40d50a1533ee617024d789c4a/bazofidejuzipuden.pdf
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/02bb102e3746e9408a1259469a14e0d2/23282641000.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac91d3a9955---27413182414.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/63edef034312374fa6ef0deada54dead/luforojed.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99e47c7ea---15407690094.pdf
    • http://polyalpan.hu/_user/file/piwukegatej.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717efc068f1---sibirevupalave.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d75f33c66---32825834511.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e911eae91---69025623162.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0c5d6996---tevumufinatulu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c78276563---zuzomimojaler.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jean+jacques+rousseau+emile+or+on+education+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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001004d.bin
2a718d1aa0f0313d233803072532bfd8cf60f7108786f564518e27241b0b8054		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 5492 bytes
font_01_sfnt_off000112ec.bin
e378fe2cbe0a0c1fa8c209de557c8e6a5fd8789e36c52f67729d5bd36a1d1a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 11376 bytes

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