Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b91ecde22ce85a…

MALICIOUS

PDF

90.5 KB Created: 2021-06-26 13:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 791fc4f19e9ed00532335b52489d9440 SHA-1: 2f29a8b81c1ea9010ea3d289912428b06e0a7b3a SHA-256: 26b91ecde22ce85a04c4f54246bc2f26bf8b78921d37dc04a9c43b0ac20e638e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and heuristics point to a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bg9r9nprbfqpp177lq9qctmfr2/56170912316.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dglc37r5n8hqvnpb7l2ns9jlis/87996074423.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/26152321993.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b108e9e01---62227949870.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fopedomozukusof.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/c845335d742110ea57181e70c85f36a0/75355398630.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608044c88baed---72859668117.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9or05t8psi1laeqvc7h2i83e2t/14299421521.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/18164e823d9b80422b7a0685e90c26f7/rexuzaluvekigaxevurujudo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428222246132.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729b3a863fc---xeletozujejupazap.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/917319fd14426a0ed8ea799a4671aeff/44738528080.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9250993992e821bd49c4b15e4c678801/kisigosinozagubebalofiser.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/1695e1d62c68c87ca92f182eb9a92eec/rivafixiwirikelufojev.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/vagonafegunagizod.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5b6060b7---93140819975.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/xojunogamazugipoma.pdfIn PDF document text
    • http://waterreducer.cn/d/files/983438766.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/04c1cfef7bd5b1e43cbc05c0dd08a262/kinudipivapimemituzobog.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4e5d1eecc3b7f41579bea51af6dfa3d5/vemiweruwil.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/299ecd889615bb8c5c91cdb47a2bb358/rupuwakisuxesipu.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/xuwexoga.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc5f814ff---85744993027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=different+types+of+pleural+effusionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 10568 bytes
SHA-256: c2a12e46090dc4670ad7f6a7c7ada10b208dee95adac1bbfe877dccaa8145ff4
font_01_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 17896 bytes
SHA-256: a11f92f7dd3a9fe9fbcc1b8188c1eaf64a5e8fc7ce7c2eb4ca4fed3a38920e33

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