Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e335b93b22aade…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 18:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17ad1c69bb07e4502c102c28f86453af SHA-1: b72c53310c2a90ec1af137aa31a4df9c58d66193 SHA-256: 88e335b93b22aade56cb1e8e0b66c27aa36b5cf75f41ab82635b31cb583f4ded
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=hotstar+app+for+android+mobile
    • http://artvideo74.ru/upfiles/files/40871437849.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ede608961d4b726d3bab9806fa8c98b4/jevolevupuz.pdf
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/xidaxopamisuwos.pdf
    • http://gcsiva.com/files/userfiles/file/pisexixapawotinus.pdf
    • http://pizzeriagiganti.ro/imagini_ws/89969481449.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26ea60fc2---9582683302.pdf
    • https://aradovan.com/userfiles/file/junutifija.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d27a4832b---jafulox.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/gl2p9rnlnga76tln6tids3emv0/liwebuzejop.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/48838895221.pdf
    • http://domadoma.cz/userfiles/file/tududaxejowu.pdf
    • http://vit-physio.de/file/11214013901.pdf
    • https://mikludava.lt/images/files/fulawetaxobo.pdf
    • http://whipitleather.com/userfiles/file/1189396422.pdf
    • http://kronospan-mofa.hu/editor_up/24870859833.pdf
    • https://ietc-oman.com/userfiles/files/71888211080.pdf
    • https://braveathlete.net/geektic/files/tojidopajinobiwopuf.pdf
    • http://abwingssuffolk1.com/uploads/files/vijonaxabunogijewot.pdf
    • https://vnjhanoi.com/upload/files/padunovubetura.pdf
    • https://berettyotv.hu/userfiles/files/93313232452.pdf
    • http://www.tokyomagic.jp/images/library/File/17697884342.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/bewunetoxavozigopotas.pdf
    • http://kystar.net/filespath/files/20210908025727.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_off0000d6a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 16792 bytes
font_01_sfnt_off0000eeb7.bin
20206a1971093c61a0554b396365f515f1bfe1dafb9b4a60399488906522414f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 10788 bytes
font_02_sfnt_off00010745.bin
055345c7ae39cb524f6da5b05394a0844d85eb096d5bff4d0a1bfbfcaf4c74fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 17084 bytes

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