Malicious PDF — malware analysis report

Static analysis result for SHA-256 21950640b6352088…

MALICIOUS

PDF

93.1 KB Created: 2021-06-25 13:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98138a170128282efc3f7e7564ee85e5 SHA-1: d6dec44adeaea66273a3a62e501ad1cb49a25858 SHA-256: 21950640b63520884d13cfa01bb29d205901d292cfdc9955af03dc5e444fd865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://garglob.ru/uplcv?utm_term=mystery+of+antiques+s2
    • http://axwelindia.com/uploads/mukipugub.pdf
    • http://pileshoppen.dk/userfiles/file/dokugi.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/64351510060.pdf
    • http://vorne-sitzen.eu/pcms/content/file/kavebesigexinimuwupovabug.pdf
    • http://hacoauto.vn/upload/files/25822373010.pdf
    • https://fentesmakina.com/paket/upload/files/xemilibutozodizuwomog.pdf
    • http://mxm-hosting.nl/img/editor/file/dafazedujevibapolis.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916cd3b246c---71160569479.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8187a36c---98251138161.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/bho8ou735g5l6c2vkq3j1125h2/63622081605.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/41500776001.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e662a4d17b---nukemanuxaloterejagu.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ca0a90f3---komupubenanari.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f544.bin
31ce2d992374aecb49f1e8845c11909d1c9100071286c51a7b4a045af3745c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 4656 bytes
font_01_sfnt_off00010649.bin
ded08cfb77fe32dfa4817e573ba9a734f9c028775b389b4c3ff08d36ee35a0b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 18332 bytes
font_02_sfnt_off00013569.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13569 16792 bytes
font_03_sfnt_off00014d80.bin
414573cd10580d5bf34f614b31e897355b85c3eee3fac1ab4835d85ecc284d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D80 10636 bytes

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