Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d92d9e37562ee9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 02:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9449041add3de7f25555be55d6a72b7a SHA-1: 1eebdd43118ee38baa68dc729326851d1398c307 SHA-256: e3d92d9e37562ee9be7eba3a86a8a973a63513b6709391f215575ec23bcbff40
156 Risk Score

Malware Insights

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

This PDF document contains a large number of links pointing to various websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document's structure as a link farm suggests an attempt to redirect users to malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f9ep2k6vnj7ce061hjbb75ej94/dasofuteromapenelorupavu.pdf In PDF document text
    • https://thaiahpa.com/flash/files/71634721077.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bdafbd6c5c14a95be308f5055488e8f9/wozezub.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/dawuvufasotetir.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/zutelitefat.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/7107482254.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/fozezatetixafotowin.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/bumakisinivomupe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e883c7c065---wujidobegaliwulilutujexix.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/lotelobosibaxagupezawemom.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7jnhfdrjvu5rs521n03bt5q26h/sumetav.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/pimewexolemeguxum.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0403481ef8---8299904200.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/99139415055.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80f8f2b172da209f74d63efb98dd6546/sadobuduvogukiwerevelume.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/70686518205.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c267aab36---57378203065.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc612ca254---newugijatubube.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde43825a40---39558724951.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/tikipikotojolewaso.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742dd14d805---pasabobukotadunapa.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4dc20259c73656612c5d0616550a4c43/futodarakovalimadiwusok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=forma%C3%A7%C3%A3o+drenagem+linf%C3%A1tica+manual+lisboaPDF 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_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 20264 bytes
SHA-256: a5a7479077c90fcbd61a951b94cf939dd16e5627413d5408a471788f71429de2
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 11680 bytes
SHA-256: 89dfdcb6d9269ff698c3b552d48b148e035d72e962199c8bd5172daa3eb50b75
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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