Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3561ad16d1c98f9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 17:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d73adfd2803b0521827f845d4d983708 SHA-1: 09947b0981f9aa00eb2fdaa5cd0eb17c5582d82f SHA-256: e3561ad16d1c98f95634139d11f1c3812c9e35ed3c9b5127c3eab7110e69b71f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious sites for phishing or SEO poisoning. Embedded JavaScript streams were also detected, suggesting potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=simcity+3000+unlimited+cheats
    • http://lsneotek.com/ckupload/files/nirategufebomorixex.pdf
    • http://www.sushmitamukherjee.com/fckimages/file/josetisasek.pdf
    • http://maryalo.com/userData/board/file/24285881647.pdf
    • https://0a3exp.com/upfiles/editor/files/72412268402.pdf
    • https://studiecarriere.it/uploads/file/lumifejixafijakegigewozi.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff130d89e---wosurexetupizerus.pdf
    • https://mobspace.xyz/web/img/podborky/files/11748426666.pdf
    • http://klwas.org/userfiles/images/file/zaledixitekivebumuxeb.pdf
    • http://naturpix.ch/cmsimages/file/11061435781.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/32082291666.pdf
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/77226678207.pdf
    • http://ttworld.hu/uploads/content_files/files/50961703479.pdf
    • http://rdmsrl.it/userfiles/files/46341114620.pdf
    • https://lemarko.com/userfiles/file/83502097447.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/19118530867.pdf
    • https://mr-alian.com/upload/ckfinder/files/85549772968.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe74c5eef8---36379765659.pdf
    • http://sk-massimo.com/js/upload/files/86154115991.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483468b7b2c---jaxadonex.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/92291627333.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/17727637859.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613798d410860---weginevovivazelos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 16792 bytes
font_01_sfnt_off0000ebda.bin
fa27d352b03ba1bcf75282ce7b4f1382fb5acd78bba98f633244d64ba96636f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 11000 bytes
font_02_sfnt_off0001053f.bin
911b0be4c288fbefd325b63565ebb21f253ef297ce4ac5ef837006c43fab726f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 17088 bytes