Malicious PDF — malware analysis report

Static analysis result for SHA-256 492786248cc1d584…

MALICIOUS

PDF

76.1 KB Created: 2021-05-06 22:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1783f8258bc759f2eab7f8659943fc05 SHA-1: 39d0e43c8f846d48d38ff09d0b0f59d16f39a994 SHA-256: 492786248cc1d5840870e2c4cab35508cdd4c0da93a0e7c6bdc5a1c90501f749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9531

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 https://pistant.ru/uplcv?utm_term=scope+and+sequence+template+physical+education
    • https://almoheetmanpower.com/public_html/userfiles/file/vutabufibuzapov.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1455d3563c1d89943d002744eb8658ba/zepidetosanu.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5976614db2c700c7fc20f9220fa44500/xakikigojedozuzuxon.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7996a17750473f184a5fa0c8ce726254/64700421277.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1d211e5a---46770779662.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792cd0c45c8---47194485537.pdf
    • http://agcslohian.com/userfiles/file/rosiwinajaz.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4522bc0f5---guwuzifomire.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lrsaq6rj5li13qnpvc4qvrvspt/35915613315.pdf
    • https://hondamienbac.vn/userfiles/file/munigebofexujelalaruvetag.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b817dc665---39953140085.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/92192edf81196282e252ca47c5b32378/98085377001.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h5jo91montmnkn5kvf9esvrv73/dinibeses.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5bf77cb14b0ceb73602cdeb85b50bd20/98156982948.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f4d7cd93edb2298fd2b3ac4b3cef1bd1/16058750005.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bu40jgmm052s83454l1dia6vjn/38237669244.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e447.bin
c349c1ea776fd7908d37b6963f6ab286781289a2e4f2668761a08a68f5771c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 5428 bytes
font_01_sfnt_off0000f688.bin
2ea94d18e087ba83e10f5f555c33549b19a761ca00b58828d9dd690bb557d2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 11504 bytes
font_02_sfnt_off00011d91.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 4324 bytes

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