Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b59d1249cdd978…

MALICIOUS

PDF

89.2 KB Created: 2021-08-23 13:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c618a698bb0f68bbaa896aff92c49f9 SHA-1: b30a4fdb05c327f7b12251f2fb6f1b36705004dd SHA-256: f0b59d1249cdd97899629e88f2854371818599520b0888690a5d7b03199240e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing or malware sites. The PDF structure and embedded content suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=metacognition+example+situation PDF link annotation
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/90710f1672c0d9e8f0cebb1b534f8051/23022585406.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/bekogano.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/17320156886.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a3d98b2adac91b0831a987eae0906276/fijewedakon.pdfIn PDF document text
    • http://fedoro.ru/upload/file/61588312553.pdfIn PDF document text
    • http://mayjack.com/upload/files/53257235585.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fbb9c58ac72a7ea81c60453848bdd755/xutojumumagol.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13899cf4f2---xamewadunaro.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/87283663392.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/12836276585.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/dakuvup.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fdd2521b---54707081975.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/xuluzupexumob.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5781a2ac---tadetotizadagapopajixa.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/xaputelinosupuwenis.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jomirotaf.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/70180587997.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c5532ea17d75eef552391286900b4348/woguwefotanotaxor.pdfIn PDF document text
    • http://cl-pub.com/files/files/29125080794.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b10d6f456ee1cd71112205dfe48ffaf8/vowugiwud.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/pexorumobowepajozidegog.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/satadetajudepiva.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/belemebebotupobufobakev.pdfIn PDF document text
    • 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_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10812 bytes
SHA-256: dd249e198878713d6ad6c7b64914c3e12a04fc3f7df573d790f0e8a69d20d96b
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 17472 bytes
SHA-256: 4dedf0614ed347efe33712b310940acdd77d1e6ae62a2840bd8e8ee8b3608fe5
font_02_sfnt_off00013cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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