Malicious PDF — malware analysis report

Static analysis result for SHA-256 221ebe5f0d1fa8c4…

MALICIOUS

PDF

93.7 KB Created: 2021-07-03 18:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39f27f1b13e64b26f1d29c0bae1c9fd9 SHA-1: f5dcb111e067217d3d9a9ab94b22fdff374a2bfb SHA-256: 221ebe5f0d1fa8c42059b890f7a8b4e604831446a003c2ae4fe40ed4fad0d26d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting further PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing secondary payloads. The structure suggests a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d791aa48ef22da3cce00d11b70472697/rowobiditusizug.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d6ec1a82---93680725739.pdf
    • http://s-privod.ru/userfiles/file/39764233939.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/447b9459ba8194b51cb2a77341a4b844/24951707973.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee8910bdb---nezove.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5a83b02ee57db37cf7e3c33349b54b76/kuzosoponefapuwi.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608149b7cbdd1---wekiwirizuwuxe.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c028c886470---towil.pdf
    • http://dokumsuzgec.com/userfiles/files/38105517574.pdf
    • http://accessiblevehicleservices.com/userfiles/file/rulakifepagaporuzixiru.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607358dd87116---98879290447.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/dorefor.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5f750fa8---jugalana.pdf
    • http://abwpetersburg.com/uploads/files/gutuvomakixiwobapazup.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609432470868f---poteloju.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/xexoburetiwowemozenegij.pdf
    • http://clubselectionvoyages.com/images/file/jaxamutur.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a15d45b8a8---jifusemoniwajivagajutuf.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2cb984ee---gotukitibubisabi.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fomjou4fn2u7pjtckoi1a93cq0/netisifogupopuzoxeroduw.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e501d436565b0cbe3582bd6916c655ec/xovexisi.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083085aa322f---fapajosovumon.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/057a2b4a297152cc6018b92346afd69f/84479208665.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091abd546b69---dugajel.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a698570a2ad---budotijezesagot.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9463062130cdd2d209b0fce140b0edb1/90867294093.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fighter+fish+female
    • 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_off00010cd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16792 bytes
font_01_sfnt_off000124ee.bin
e47130b3ff607aaf463abfd758b85fcd1b6b2df97a679f7e77b386526d312ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 10416 bytes
font_02_sfnt_off00013c78.bin
11c797408dfc8049966f9ebf3102c870d438ad0aec5dc5846b628bed0abc8022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C78 17224 bytes

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