Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f8f5130de3f603…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 23:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e5a4a733a0c4bf7459f82b7d1f1902f SHA-1: a3f8e5f16ddda9fa719e335e0b55abd6c296d03b SHA-256: 92f8f5130de3f603591749a8a036aba70843bca8fff3c0c57dd774b17357828a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://beachfirebrands.com/userfiles/file/nevozomikerofepo.pdf In PDF document text
    • http://chaitraglaze.com/uploads/2389582389.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/48782851677.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608146678d461---rovadefasamaxeberofoj.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/venaki.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609030e9f1c26---98850898564.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/witakitojawisa.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bc99e924---tegemilarebosazefomakaxog.pdfIn PDF document text
    • http://hkacca.com/userfiles/32355941444.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7d3b40cfaab7f7caa680888d9427f0f9/fesedasuzubovawokinud.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nodidifitadibajiwifuje.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/tonuzukaliworujokoto.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/360ad870b191bc64cac6566aaaa714e0/18448144464.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/20488158406.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/85164450840.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ba16c787.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/titunojode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+to+urdu+vocabulary+list+pdfPDF 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_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 21820 bytes
SHA-256: 5b11916a2566e45c113ff24d7fd102698ced61e35779657d59064467e55b047e
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 11168 bytes
SHA-256: ce12d18c9c1b5eb246d000474adf99179af5fc6fd910961dd240a62eb4ccde78

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