Malicious PDF — malware analysis report

Static analysis result for SHA-256 263a6358c1274a50…

MALICIOUS

PDF

91.6 KB Created: 2021-07-30 22:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56f8fd521b1ed93264ad25e2cbe5585f SHA-1: 0b26a3e09bfa04f05e2b7ea4473c6f9e90b8e387 SHA-256: 263a6358c1274a50b7f76fae514bd4a232f48b4898ca62b52f7d307fb7613269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/824c8634a4cc6324b12ea5519d9fc4fe/rusijazutitupot.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0ltuk6g5g2le62m8rinjuldh0/vivirozugagogevefali.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/73477496152.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/l50v0pj8973h5k252u3r5l1fmq/tidasedabitevili.pdfIn PDF document text
    • http://licausi.it/userfiles/files/52849845822.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160849b92bc018---risuzipedijabovixu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/229917f7366c3e68c16d61727b324c30/47185940818.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/godewimevebupifiza.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e61e6fea---pokixoma.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jitit.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b25932ae671---pujimufijumelotamozug.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/87246303991.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160964515a96aa---48021757239.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/81343893882.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/dizipikorebujo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098a468811a2---26161959144.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/latisujefilirezagin.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/bebitorutudu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3ea73d0d---23578823687.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1951b56d8---fipawupez.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/85216849132.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee9c89851---94132340524.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/68309449549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=segundo+curso+de+contabilidad+elias+lara+flores+pdf+onlinePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 19488 bytes
SHA-256: 5b1630a79d800e75a99bb7756f8a5e3242f2db5e1a21ff4615293496993b59b8
font_01_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 11108 bytes
SHA-256: d0b033e881ca921494891662f6d2d4bb63d2892051c57d63217d5ae501923e0c
font_02_sfnt_off00013b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4D 2752 bytes
SHA-256: dd1ab283f3a59b0a70af24d42702b9e2d976e5aac2cd97268daad6e31e24fd5d
font_03_sfnt_off000146bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1