Malicious PDF — malware analysis report

Static analysis result for SHA-256 471f83f9fe70c468…

MALICIOUS

PDF

71.1 KB Created: 2021-08-13 23:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d3a8e3a4d281e6b636f69c7854dd0fe SHA-1: b660cb5e5467c481f0109533563a9186ba593832 SHA-256: 471f83f9fe70c468ba82f2de7ec9b782777eaec09f29b6f64a03d318d8d367e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims through deceptive means, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=descargar+juegos+xbox+clasica PDF link annotation
    • https://alrukn.co/userfiles/files/43319395078.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/h3npgrolibbdf08ivv131pq3ft/konukamarog.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b9e9dfb5---vusoroturigopugorijudo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e741f91a---bagazisero.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7397293e---befubebom.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/feneda.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/13601366777.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3da23d33dbc10505e122931330012bf/pakuvagupugaguluro.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/selavuz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafaf3bb5f---18865401219.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38fc37f7bb---3384624595.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/soxur.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/58188307274.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/93292433013.pdfIn PDF document text
    • http://olivia-mitzvah-2020.com/clients/b/ba/ba4af741f15bd7b6832e7848668b55b8/File/vawuvibeluvabirokava.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ee000c96fa441a6354c880d4ed80696f/55567623013.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/98hfdnunvndo96fd7q1e725p3h/dozuvizelap.pdfIn PDF document text
    • https://orangerun.re/photo/files/25028679016.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/89203571533.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019e0bd330---powegixaboxaxijobosol.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3ac620f80371fedacd2080766cdbc59f/lukejuxibabofaderejipolu.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/posusajovazot.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_off0000b56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 10676 bytes
SHA-256: e51421e04c1662a222dcad45e9bb50b4aada5b99d539d18b5fab355633678e34
font_01_sfnt_off0000ce0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0C 15568 bytes
SHA-256: 07a1f5d0c7737058961c1ede9feeeb4bfd84a3aefbc6167ba7e2155ca512b0d5
font_02_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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