Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19bb10f1d7bf8e1…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 08:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43bb6569a15b5c9afe7400e25828fb8d SHA-1: 152e6487c379299ff91b0e121b78f5a122f22ad1 SHA-256: a19bb10f1d7bf8e11d0b27c4068ced3b8a09719deffdbe580322c4c3a69be177
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a distribution or phishing campaign. No scripts were extracted, but the primary attack pattern involves leveraging compromised infrastructure to host malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=cartas+de+la+tierra+pdf PDF link annotation
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4009cbcc96da767aea652304daf8191d/25563187583.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/aq67h8khn91m8ndrfhehbtvm0l/7037864549.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/voxijanijuwanul.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8a92a28f---82577622521.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/83a1f9f8bc8d10bf6d8ca3cd777b6952/17205996423.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad7febf93---sevoxajarakenajoz.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/dexomapisiv.pdfIn PDF document text
    • http://idroter.org/userfiles/files/jisoges.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i6tm9itlugi3vrmgfhrvpj1q3k/muwakilirezimobawa.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/neketivepunegafap.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9dbb02efc---nulewabatavugenumodafami.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/17251160307.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2108010309220735016vrmkmlgw7r9.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/vixodetipiral.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6eff9f4061---46439276167.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a040cbe2a1a073fb92bc4e5f3a7ee4b5/lolegapenabudopodo.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/fizemewobodomu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/13d5f418f1b5d5b69ecf892a5bdec98f/16616583596.pdfIn PDF document text
    • http://wixoon.hu/upload/file/pajibituvogujagatal.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/zamojamefasifajevaza.pdfIn PDF document text
    • http://perfecthospitals.com/ckfinder/userfiles/files/kejopepixojetorigeli.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/56feba5ff02e84bd0fdd6d40298135c0/mitukisilefubetusane.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//47625729544.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_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16740 bytes
SHA-256: e6c2c460e31518809c9e3b5ff47a9d84aa29f6ee7c902d1240f8caf751d2471a
font_02_sfnt_off000134af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AF 10296 bytes
SHA-256: 255ea181edac3cf99ac60c196af6f158fe298e2127cbeffc48780344df7a1ab9

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