Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9851fc286ec1fb0…

MALICIOUS

PDF

89.3 KB Created: 2021-08-09 07:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38e4c9084261e38be9b8a0ab7d7e3cdb SHA-1: 7fbe3887bce4ea1068fddbe59b3aef2b2cac1d03 SHA-256: c9851fc286ec1fb070b7f146fbdaf1cd8e2864b47a33ddce6aab3e6e5491ee6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=musica+del+recuerdo+a%C3%B1os+80+y+90 PDF link annotation
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4c678098dc7ec1403fd4542cbb31005e/dazam.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/68142661891.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/28410267282.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe982977a---19202294119.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210724024350.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/86512772762.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/49596818897.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e049ab5291---kidavukole.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/35415223133.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c18c312a7---77098338688.pdfIn PDF document text
    • http://slsnn.ru/content/files/jazalokuwuwa.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609122457b34e---57972272182.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/fegureguvajanigo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608729a31e312---vatatabakujedowimekalij.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ddtviptiknrpai51iousn8unuv/81865990443.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/sofalalizevesasupafuza.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/jisefamodezarabob.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/t304loocddock567tp5t9ptgao/gutujogikelav.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/famul.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f45dcb9e---83255997650.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfa5659d8---folivemebamosowodorot.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/164c0272884084a8c1631f00e797ef1a/dubidanas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 17700 bytes
SHA-256: f280c5968f4e4aad9d6759a621a617dda2d64909e82706a592ea2f221f780204
font_01_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B27 11072 bytes
SHA-256: 3555882a4e3ec5dc36e98a9e83287537ef1545ecaefe7e5be0f6c1cc89f4b0c3

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