Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a18a727107fc623…

MALICIOUS

PDF

71.6 KB Created: 2021-05-29 22:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39649f180acbeb049c88fcdeb6034cf SHA-1: c47504a041f82509517dfe1ae435a9b88a4b6a34 SHA-256: 1a18a727107fc623160e381d8cda3836a686b9a6af2e6e70559004799387155f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/el1mio48f3l6pu3u4dt9u4c3g6/76461841876.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/caa2daef919125a8b9374cc1c4989770/bexidipizubatufugojoma.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160778da070304---27649102142.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d55056b5542a6d895848523da21eef9d/toleraxe.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608938f8a2c35---83533231322.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841bae6cd6c---2878965406.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607863032dc25---dumakana.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070624eb3ea0---96041298632.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/54601024650.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4f45ea81eadeb1a8e74ac02d1bb779aa/gasetirabob.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/16ate1h5cg75gccegh01f38dr3/xumenevozus.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/661779a862fdc56dbd3c267d38620e93/45775924074.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd74ce3a5---gumadoxadinukuxuxapirale.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc038ca064---tuzuzew.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/38e7f5db10d27ee33b960868086d8ac2/puruvilenijakiwemajujoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=reading+exercises+for+grade+1+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_off0000d98d.bin
bd365d8da5b7d8cd4b62f79f3140d18681a7889e210763155de836f35ee8958d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 5420 bytes
font_01_sfnt_off0000ec22.bin
509fa8faae9d115a1ef28c34536d2c8fb3c46c005e797fe45686afa882994e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 11104 bytes