Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdb41e6dadd16b2…

MALICIOUS

PDF

100.1 KB Created: 2021-08-03 13:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2b239d0c068c4d2864a82c03aaa1905 SHA-1: e5757b82c523380fb6a62f6a8b8621479ab7f133 SHA-256: 5cdb41e6dadd16b2054ac48fd56859c86bfdf7d328f165bfd3ec92964e671d41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of these links suggests an intent to redirect users to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the structure indicates a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://iccarrentals.com/files/file/82051537255.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/96o45nejr4ig32b0g2bmmfvuad/97573127384.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609efa0e54ee4---99110434474.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/41753604608.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/34280692863.pdfIn PDF document text
    • http://atek-ent.com/upload/file/sorevagugikodoxapipunelu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a34d2db7a2c9bfae21e7c277516a761d/28899091414.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jurufilagamemapuge.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160828225d9a66---44027102977.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/zajural.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/ruxaxed.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/felonekujur.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c36e254d939cc16e03cc5d25e77f6c89/soweko.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd84e37b4---53880007384.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/tusegubuparesexin.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b13e6752e---gatonunuvomasubazez.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803098415ab---nijubegusivutunotutol.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c97fea963e14ce27c916115af98edc4e/9751241998.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/5845503450.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ff0ac99713ca48ca90c8f6d422b2c81c/katuzafeg.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160729cb340a08---pazemokipuvu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfb511b8d---xonexivelupezizisiluxami.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dda823d6fc6c4e8b10fa65ddc9210ddf/pulunidilusewuwezorutaz.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gezazexabefazoguzelipal.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/16628942005.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1e59a740---20401313545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=conceptual+physics+chapter+9+gravity+inverse+square+law+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 11364 bytes
SHA-256: ae7aed757e07a8332aeb1a987aeb994bbc0c733a342e9b50acc90f60f435aa69
font_01_sfnt_off0001370b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 18204 bytes
SHA-256: 35b7fc9ba263ba862013523862f0e4a5e39c883c109aa52de9fd5cdc4b61f456
font_02_sfnt_off0001672e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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