Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bae25b710c6038b…

MALICIOUS

PDF

105.5 KB Created: 2021-06-29 19:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d2209ce4c287f09637610b08e9ea0f1 SHA-1: d6c17f1e97d143e51a4d78ca399bcb02c593a941 SHA-256: 1bae25b710c6038bf5bc018076d27439473c31d1ef802593a8b112908d80ea10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://laborke.ru/uplcv?utm_term=real+world+applications+of+linear+equations PDF link annotation
    • http://tanphatinst.com/vietkiendo/upload/file/vafinexixasunixume.pdfIn PDF document text
    • http://chineseclothingonline.net/File/fazavexanelixox.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/tuxepowuvafativadelup.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086754274810---wemasafevudoxezax.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7cb5d69a5---segax.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/f3ncruant30cvrn1l1a0v9840r/58025219903.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3acfcd26966a6cf98230bcca0000d345/vebafukukisimubijebo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c607910439---guxisukinapapi.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/76298096468.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/41881841396.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p22f3pqivsrle2g3d01u8oajs3/fovedegenenosowatomed.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/46585146549.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sobafuzulixudokeruvak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d198f48274---75536735215.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r5vjn51m82fq11bko4j1vrofs3/likuwekirirasuwebapixumaj.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ca033d7155a---72625234911.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29785be08---kanitokolesuvuxenuzeme.pdfIn PDF document text
    • https://inncredel.com/uploads/fupaweza.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/82936025649.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607506959d56d---60279171004.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5v47pe9i6bmrs2duqe9noducg3/zonuxixogob.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wuwepuzefidorumezu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5312d1dc---tunesasosefelofija.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_off00013512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13512 10988 bytes
SHA-256: 94e52c30e971b30de4c10858e9167f97417aa754641870b6892cbd0c46910d59
font_01_sfnt_off00014e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8F 19324 bytes
SHA-256: 561f2b1e7b3b8a61d63fe66c86a4a3b6ea1c8556c56d2e005e60772481a8211c
font_02_sfnt_off0001806e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1806E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1