Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17b3e58d42d981…

MALICIOUS

PDF

86.3 KB Created: 2021-06-15 14:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6788538023be32a79b898b9eeddacb2 SHA-1: 6eeeb107b71c3e25b39dcad1aaf48413383a6ae6 SHA-256: 6a17b3e58d42d981da6bdece1a5705424c2966efbd6ad9ad6970e3e6e20dd15d
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially harmful external sites.

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://drafthe.ru/uplcv?utm_term=echo+srm+225+oil+mixture
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4942952e7d4c4327348e738a78fa8719/91027867267.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/df070vdfcjaj35ek9l6oed3hq7/45117973724.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6580e66a3---jonutiwiwemo.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/etn5dodv40228hg6e79u6r1sm3/daguzo.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/sexijemalodikulu.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6a7240b4c65e3fd7b0e29017d24a6e40/54373267483.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c458a468bc6b4017cddcdc45a49f19a4/31943779482.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090674806a0d---80846023649.pdf
    • https://geniodelweb.com/file/tebemis.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608f377e66a02---gutinazejasupixema.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fc0a0af1b91e12a2bb2effaf8deeb114/bukifalorigibamunojemoka.pdf
    • https://fedico.ca/upload/editor/file/5121562036.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e213e2368---11324081423.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acab8316c33---nogebozedusumefebek.pdf
    • https://agrilaui.com/userfiles/file/nonifisozavutomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00011390.bin
4b1de3488edc570c6a1760f6e0c6f997e07f848078e6a778d48348df27daa2ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 5108 bytes
font_01_sfnt_off000124d8.bin
fdd5705cf7fb92bdd3a65d37f8c013dcb29531017b19b035af4332570b6b3f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 11816 bytes

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