Malicious PDF — malware analysis report

Static analysis result for SHA-256 c546b884a061e83e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 00:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9702292ea44ea4c1db348947616444b8 SHA-1: dcf9720a9544d0ece8cb3ffad65750d68aac119f SHA-256: c546b884a061e83e0b033de25f263176c543b61cfc07f9cc09fd5a1701b7ec75
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to external sites that host PDF files, likely containing malware. The presence of a visual download button further supports a social engineering lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=next+launcher+3d+apk+download+free
    • https://immo-cjeanpaul.lu/userfiles/files/18138624359.pdf
    • http://ausafe.net/images/art/files/79114037010.pdf
    • http://jjmcp.jp/userfiles/Image/file/15548370953.pdf
    • https://graphicart.ro/fckfiles/file/46061980820.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7e692d71---36393772534.pdf
    • https://magnanelli.com/userfiles/file/49239786167.pdf
    • https://rosettes.it/userfiles/file/rusazireluvusobobogek.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082e125498---wawemizufinafobiwinof.pdf
    • http://asr-net.ru/uploads/files/dujuvepojaneribedefatum.pdf
    • http://compsult.net/userfiles/file/memanupewomoxaxoxew.pdf
    • http://carszana.com/image/upload/File/44677444559.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/werevanutepilobux.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e22733841---xevututulewufoxuvedu.pdf
    • http://binhchuachay.info/Images_upload/files/rarawolofeburusivorefe.pdf
    • http://trieuduong.com/images/Download/11142731710.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5c33bb0bf---37729440484.pdf
    • http://yeditepegumruk.com/userfiles/79121666441.pdf
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/vutalefunomimunajopi.pdf
    • http://geomanteia.com/userfiles/files/zokezo.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28110190262.pdf
    • http://domki-kopalino.pl/pliki/mipexepod.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_off0000b38c.bin
88d7f3b8a71054b2e4f4d0492c67116092e9a47b222416f6262bc56bc5a2687f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 10988 bytes
font_01_sfnt_off0000cd1e.bin
272973ee03aadaf5e44bcb4de8a221931e8ccce23561ff50e75b15d35f399009		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 17480 bytes
font_02_sfnt_off0000fa6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16792 bytes

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