Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40ceb6e3e9e1faa…

MALICIOUS

PDF

87.8 KB Created: 2021-07-28 05:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9af65a10f25d8db19222dab7394a48b3 SHA-1: 4a09da968887b56d2f680869bf277969a1a6f14b SHA-256: c40ceb6e3e9e1faafa21e6cf6ff5df11bc41ad1817ce1f9dc8f87941a5c64d91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af07ce9d741---rexoka.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a7c9b388---liweguvolozenobatajenaf.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b6h4t2ij4c6qq5gj5e76gsf92l/natitoloti.pdfIn PDF document text
    • https://afayl.com/userfiles/file/38364310007.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/82da363d251a825c6e10c75db300e271/leziwu.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/al0g49a14bh43tp4nfq8q3bfm2/91732345826.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051803170670554.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/23636663938.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd30e420de---fexomunawarevan.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c611067db9---72538374223.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725fb675bfa---58253970001.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/28305080460.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bd06e1195dcdb42441c0757932b7af20/16679529567.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/12k6v7nd3vsgbcvl615mgdlb31/pafixagir.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43785043d0---39878751130.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/oeq7bnn239ef754g55ib53gked/boforupusutemewevusinosa.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/80880147336.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/68476675914.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/67022399422.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/sabuxusujametuzex.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4m9gsgcj8dmf7pqo46nuotf78v/27739440827.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22e84092ee156e05689cc0480ebd65e1/33422573717.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868fec776b---51355548840.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/pogixogugegaw.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/p9m1goj655o9eji8p6e5o3qasv/92079024472.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67307959597.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/61186549306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+knot+for+hanging+porch+swingPDF 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_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 17108 bytes
SHA-256: c14f10d1ba3501e89dc41f95522420720f24b53977aa66eac575f6b7079846b0
font_02_sfnt_off00013745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13745 10944 bytes
SHA-256: a51954bba06b72730e4628474ef256abd543826cbc393c5204afc36144f28927

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