Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0de449f2d32215…

MALICIOUS

PDF

81.3 KB Created: 2021-06-25 17:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d931516ed4f15cce2fcd1007b3357cf SHA-1: 08173e169ed704803d9e4b111c46f251e5b12042 SHA-256: fb0de449f2d32215f982eac524d2986a48b3958eb2b07c4b6f4eaea0c6339fa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest a sophisticated redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=wedding+party+dance+songs+country
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9bde7654f6025ec557156d680f3173a2/jexixozuvif.pdf
    • https://dietacud.eu/upload/file/19719325859.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd0ce2dd5---6925945755.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9ktv8jhn02kkmpvh7nqpabjju0/rivasexipazog.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac73fdd3eed---mejuzewuvajinafedapawugo.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/stavv43rkkfa468v2safu73olt/91484341000.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/49588517889.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2004bc278---20237286936.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7e6fe160b473e370d90ffcbf22f05e37/98252862438.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608504c2b070d---givewolegoku.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aa10110c9---42937592991.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831ed7d647---vadibofafosuvik.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b5aeeabe---xeziwigitatimu.pdf
    • http://scbczy.cn/up_files/file/20210624_124635.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d210fa4ade---kojizasoxileteriwodotum.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_off0000dbee.bin
83ffc35a461ba6fe8cd810b893a5252bca87c25c92d85b6bbde7e1ac1ee72d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16872 bytes
font_01_sfnt_off0001077e.bin
5d889a65982a3c419cfc2a6c96f7c6ad0d181bf650a8e9af9e8204f74ad1e7d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 10848 bytes
font_02_sfnt_off00012083.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 16792 bytes

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