Malicious PDF — malware analysis report

Static analysis result for SHA-256 2279d92784118a67…

MALICIOUS

PDF

76.3 KB Created: 2021-06-10 09:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f1d964d3c1841526f136863c2469980 SHA-1: eb5c546952a277f910e87b0ab6bbd8105a6387a5 SHA-256: 2279d92784118a67d920525cc4f72d5e3e77554f08b475dc11a7953b90fcc4bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to redirect users to potentially harmful content.

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://ketchas.ru/uplcv?utm_term=kermit+voice+modulator
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e0f3aa679---34472051344.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b88c27ec226b95534f12ea33f4b26a48/xegivigomekupevazopida.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d41de84d4---84445926366.pdf
    • http://bendhorseride.com/userfiles/file/fawofeli.pdf
    • http://portalcom-b2b.es/img/user///file/_0462768001620346120.pdf
    • http://frezerovka.by/images/fxeditor/file/54244285544.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0f9b4ca639e428bee91075f44ab31928/22462948898.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dd0b20e6---pubuzopitomuj.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ac09c868879f9f892421f184ba28b059/sodogejamavuzo.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/e4iv69gqve9ksmclvp4845bhj3/74690169813.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089c29fc0297---66201894054.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/n6nfqai1uvacj8dta18ehq3nns/fafepiwasiretifemo.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cr8elta1e7fjqg01ncfsu0hq53/59717212388.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_off0000ebea.bin
b134e3b85ff42744f4aaa5a3d5a1df554d9be1ecc03e48ee664f515f5a6dd149		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 4936 bytes
font_01_sfnt_off0000fca3.bin
f8a238eac94768db1c40f3a13cde3030f8b3768435881fc3350ae2ef6ec6dcb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 11524 bytes

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