Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54a443cba292ed3…

MALICIOUS

PDF

92.4 KB Created: 2021-08-04 05:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bece41f814426f5eeb490ee17b4cc58f SHA-1: 5c40593fb55bc20e3a4f7d75cb3e353254f2e4d4 SHA-256: d54a443cba292ed3ccad5f7f8d40753e1c09948f428e83b802ab1fb1e28d36bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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 https://queure.ru/uplcv?utm_term=basic+rugby+rules+for+dummies PDF link annotation
    • http://onishi-kyosendo.jp/archive/vuxiwalukozonavuv.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/zitot.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/80632844258.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/sezefumitelakarot.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160713166afdb8---67429370258.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/95677218789.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o88ssu1p2m52a3l6u1lb1prnbc/somuvisudadoruzor.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e14369f6dbaa8dc0bc1e5c54e9f69904/lubedigejevamokuroxepod.pdfIn PDF document text
    • https://industriameccanica.it/file/bewopazizikuziwa.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f492c82b---lutuvugevulosikurozup.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/24698573480.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/rarosojo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fcf3cd36---witeforajodibezivopigi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/33792128392.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o385pmsm9uamu1okegpil045br/musik.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/fujelidizezelubitevufag.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/6496834016.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/semil.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf20110ce---98890924452.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/f3ff9e21a30b9062b33cda81171e68b4/39363607164.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/73dfb529a92b4effc27d89d651b54e41/wumevifajutexaxowaranetuk.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/59795343415.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_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 19100 bytes
SHA-256: 46f20c01f0dd3f121a7053e8b6707d241017b11ff2499c23d1ae1a44afb9bdb5
font_01_sfnt_off000131b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 11024 bytes
SHA-256: f65e7157c29e6219f18ac9ee8bbaecbb126e4afe62e98872adb9df37bd248395
font_02_sfnt_off00014b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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