Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe01bd3c3add1e2…

MALICIOUS

PDF

77.9 KB Created: 2021-09-22 20:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 920acb0ed2ae6b963cfa10602eab0ecd SHA-1: e2904a4db7c9223fece9a53e37ad11b32e25d4bc SHA-256: ebe01bd3c3add1e204237a3f4df408fb4e1f344f6afa2685294d4b7b152875c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links and the nature of their hosting suggest a tactic to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://delta-relay.be/userfiles/file/zozugaji.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/33630804337.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d6a5c915f87a59a91642fbb14eaa9f61/83106222528.pdf
    • https://marljivo.hr/userfiles/file/73199373920.pdf
    • http://www.og2c.com/images/file/fagarija.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/jugav.pdf
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/90172184022.pdf
    • http://appartementslisa.it/an3_Uploads/file/6616185762.pdf
    • http://ryukatsu.com/userData/board/file/dosivaxaxavebuvise.pdf
    • http://orsini-blasioli.it/userfiles/files/63579935397.pdf
    • http://rideco.hu/upload/file/79663347291.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b411c28a1b---41759083730.pdf
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/wusivoripawivifosujedoko.pdf
    • http://curry-box-deluxe.de/userfiles/file/fabogopika.pdf
    • http://konberdbio.com/upload/files/46306861120.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2ebc998619655a206eb710cd4486936e/84792277516.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wooplus+apk+download
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132485d69279---lapojirulaweximumobazobe.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_off0000cd86.bin
ad35f16220fee92e6e4e5f44f1c2ef6e4a197c7dbe87f9fe3cad77b88a4c201f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 17868 bytes
font_01_sfnt_off0000fb89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 16792 bytes
font_02_sfnt_off000113a0.bin
76f60ff209d863b44bbfc6fae5397567a9e5d6156795cdd6e644c7dc9cac0cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 10232 bytes

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