Malicious PDF — malware analysis report

Static analysis result for SHA-256 7297dc5400cf8e0e…

MALICIOUS

PDF

140.7 KB Created: 2021-06-23 03:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 508c55dcca5e977d954a4e9fc064218c SHA-1: b145f938fe8c505395e495c708fb2a13947ccfbd SHA-256: 7297dc5400cf8e0edb23f312ce1fd5f817eb9785dfa9c9b15b3e8e593f274f1b
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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

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 https://krisoc.ru/uplcv?utm_term=histoire+de+la+langue+francaise+pdf PDF link annotation
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mcb9i4gq3nrv2107rhpgh1gaa2/5678375814.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04eed9968---34381874536.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc78875ad---pasorapifarizupapuw.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/60819940196.pdfIn PDF document text
    • http://aps-mes.com/files/file/89201077954.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/40a38cdbd42fdeb081ab0bacc0761a2f/vixuzevika.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/sigewas.pdfIn PDF document text
    • https://aedwea.com/upload/foto/72613327991.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/88959203439.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f46e192c730f6b77839aeb359491acf6/44537789046.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wulufa.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/2de63e6f392c8b435e1660d419f541eb/6203923938.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d7675836---13889405470.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/jokij.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/45cik2phppp12fs8ia8s3js3v3/sezezewodikafulukida.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/18653349298.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b1oqmocgcm3p63nd5as87dvnrp/kokizijagusor.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ktgsjgd8kefnlq6dm20en7jrp2/kokurabalinogore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0001c125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C125 5284 bytes
SHA-256: 86fae9c938ed5c87898b17aa94468d8dcb4e901b4e060852d1073de5731b9ca8
font_01_sfnt_off0001d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D331 22260 bytes
SHA-256: 2d4dc80871fca556534a652de68e5cf8cc8d77061db11e30b2fca5b6cba62597
font_02_sfnt_off00020e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E34 16136 bytes
SHA-256: 2df60db25c4006ebf5ce7f30ca7461b7931ff48239c1caafece913cf4cb3b6f2