Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9d06e794f16630…

MALICIOUS

PDF

69.4 KB Created: 2021-09-18 10:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcb255ac7652a2690c17dd032a2cf145 SHA-1: d126d95bceeb2379b8e0b300eb6512e88f688cf1 SHA-256: ad9d06e794f1663013f8f37e68a537f74403dac8d593ee788c021ff739860f80
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=super+street+fighter+2+android+game+download
    • http://lycee-elm.info/userfiles/file/nefuxivuku.pdf
    • http://santeh.md/img/files/wedeboloxeru.pdf
    • http://chinastom.ru/userfiles/file/73694691019.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/86676379984.pdf
    • http://mexxeopaint.com/upload/files/24436232678.pdf
    • http://cabanagarden.hu/editor_up/91608882501.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/febotipivokukadejejenases.pdf
    • http://acecaalcoy.com/userfiles/file/maragovojumos.pdf
    • http://birizgardenhotel.com/userfiles/file/97057698989.pdf
    • http://loaamtran.com/files/usersfiles/files/84824431688.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210912_194624.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351278522bb---davakanoparud.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161369f466a6a0---57186132078.pdf
    • http://pileki.com/imgup/file/10849876106.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/xabotev.pdf
    • http://sushistoryus.com/uploads/files/90582174572.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131399b88f13---25197029405.pdf
    • http://molenat-energies.fr/molenat.com/images/editor/file/43532796628.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/96723227950.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/sekezapubipideser.pdf
    • http://kaies.net/upfiles/2109121849211373823tl1tr.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_off0000b034.bin
bc7dae574e6d4ba3e669171d02469aae9bc21d1331bd381f7974ad03a9555cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 14976 bytes
font_01_sfnt_off0000d61c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 16792 bytes
font_02_sfnt_off0000ee33.bin
9ec7d8bf6fe3e2174b1b8b1664c8b924b0400367bac205336943c8ed12994c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 11324 bytes

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