Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56914db998872af…

MALICIOUS

PDF

99.5 KB Created: 2021-09-01 09:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 102b75fdb4bd6c256e3b9cffe33caee8 SHA-1: 690decce9ccbc7d7eab6e72a3c3d1beba577daef SHA-256: f56914db998872afff8a0b9d180957ca39886e9f63ca9113f4db34a95172f965
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The document's structure suggests it's designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content, rather than for direct user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/47307429b8633a8c59cd631b96fb6992/zodetizaretubafofo.pdf In PDF document text
    • http://moscow-vernisage.com/files/files/lebofibukasodibitajexor.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kncftotaumhb80ntpkrbt0bhdg/73048767331.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/t6n2r6b831aogi3umhr5u9tju7/wurujukurabumer.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/31196327579.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a19556772---13859515992.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dc59dc49---didujijeborime.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d33e6420febff87ab2c41e4d917979fa/faxenixulevidazapuju.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81f6b30d8---xukenoxoguvikoved.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/35792660386.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/falunajulinajelutavaso.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/53572287579.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/wipezi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/sramahn0gkloa6h4q8h0fr6i9f/41667014712.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/jazogolalexep.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/90699842673.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd49d96492---xiwaku.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c91f14fc---90399047245.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072e584ee982---45675986085.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/lovemo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/61c9b583b0907cfe6ee293b69eefeef6/lejevewepidarisumotuwokuv.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/zamurelenumome.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ccdab7fe---katuzejupofukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=10+prophetic+meaningPDF 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_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 18924 bytes
SHA-256: a503b2349c48d5491a2cc53440c990444ba39c26b496747bd38bbf0a517a0f03
font_01_sfnt_off00014edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDF 10684 bytes
SHA-256: 236a79d70468586a908a83a405bce7af50756f14d2ced7ff8eaa915363576c0a
font_02_sfnt_off0001672c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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