Malicious PDF — malware analysis report

Static analysis result for SHA-256 84966b8d49e31f88…

MALICIOUS

PDF

103.4 KB Created: 2021-07-27 10:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 233109de3efaeb784cbbbbf05e457098 SHA-1: 414542087f645e32ba0230a7e0c0ea6467bf3b60 SHA-256: 84966b8d49e31f88cc65edeb9efcd0d4a59aa96bd3a6d2342230c09c2707f3e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suwinuvi.pdf In PDF document text
    • https://grupo-kayros.com/userfiles/file/vejibarobitabugipuvana.pdfIn PDF document text
    • https://ijpdua.com/contents//files/xegav.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/81019sg0cspn4e2emukb554j43/57400734925.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16081045e3930f---nufipegopar.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/af5c899318453be33598e2b9d456a070/pelubuwebozakujep.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8cc193d8---14716524917.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315f0563d4---41537986443.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be583bd1106---fizenamobosamoj.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7vvismr6ie5e0jojbifj8dj223/26441967729.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894a16d8046---18034544611.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/26922975187.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2a5f5ff6886ccaf224cfa5c67421f585/guzunalovitofiwep.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/fanijimunokesajelekugizob.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/ropoborajajetaratefiw.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/82492959801.pdfIn PDF document text
    • http://mcalesterhighschool1960sreunion.com/clients/e/e6/e641a1dc2b4fc8b0483efb779338bfbd/File/jewusepir.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/62065165890.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a83e1091---25735326897.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/fivogorakilipedinige.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/sizoposanibezemar.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/03b71700f0752824d9d094a01acdc944/bogifugoxorovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+epson+printer+can+i+use+for+sublimationPDF 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_off00012e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14675 10976 bytes
SHA-256: 5378662bf9816fc9e2c9f3080b43f0e6886d8b4098e4e5bf9090420ee2de6d8a
font_02_sfnt_off00015f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F83 17664 bytes
SHA-256: c2cd2fc90010f4b3acaa48a6f67134b99b9866fdd1ffaf15063a6dd376732ba8

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