Malicious PDF — malware analysis report

Static analysis result for SHA-256 88feec0f8226e9bc…

MALICIOUS

PDF

94.9 KB Created: 2021-07-25 09:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c7df3c06c4e8b4b48a1b221d30146d23 SHA-1: 0874dc4edeb8df80b0f84d95913254239cc2e666 SHA-256: 88feec0f8226e9bcfa4eaa00355605e6b2f59e3135269d3ab8a8968219ac5862
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 acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kingtonkatsu.com/uploads/files/xikekedimi.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8527843c---jaxuxegivip.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82bac78d96---rowegesikatikuze.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/flmdfr4ssh23tdqum8obju76ib/94553214577.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31e3dfce5---zanirakopogigoki.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/ruvasisapuduzog.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/robonuxawujuvilugo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b24362fc391b23300caabe0b45ba73f4/natedofelu.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/97909506552.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/zijulig.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fukokov.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/fovelukumujupaba.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/97893311947.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hme97u9tqo8l576haki1koqpcg/tupagolu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5aaff34---kafopoki.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/bdcc24af22053381f4d18ef11f1f30e4/juvux.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a19d113dab6---dobixezigoj.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/73113909524.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090af6d7050d---pivosekuzonomesit.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/c858e402c22fec381546a769e747c6d3/25905765671.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/jogor.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/kuwusasupaxazisakuxer.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/952c43beaf9e23e2cc0446e314d8ba75/3788111477.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/dc744dc82e881b8149c0f4896b9410dc/1017692492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=maplestory+battle+mage+skill+guidePDF 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_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 11068 bytes
SHA-256: ab20f1808ab7dac9234020369ae01b153c8b48c92c809e4ed259f43598b28718
font_01_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 17560 bytes
SHA-256: bc8372958a020f27e911f1232135d65312788a6a603f228d9f97e6319a7605d8
font_02_sfnt_off00015491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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