Malicious PDF — malware analysis report

Static analysis result for SHA-256 9746a94094cbf67d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 16:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e17b241c43933d22dcda6045e83c3cd5 SHA-1: 31451b5e14fd0789495ebd9b8b31497c727463cc SHA-256: 9746a94094cbf67d1dea684fe4e2434ce5e61123215533c75ed130a8896a9765
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery attempt. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=business+plans+examples+pdf PDF link annotation
    • https://perfectsextherapy.com/public_html/userfiles/file/94083993663.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/89b9b1fff81bd1f1611ebbf46d839fcb/finalafovolugud.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/31752166368.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g6n6p2k6qfrc86ihifvqc58620/mimulidofovogarom.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611289fddf261.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e9a26bddb7c29a05415f6199e7e4427e/lisifo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb8a653b8---dobozor.pdfIn PDF document text
    • http://sns.hu/_user/file/sivuguja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979bd463995---zolavaren.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/vakitonakuxuniku.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/35a562b24e8c25dd48848d87b902393f/9553345727.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/15d2e2d6592302d3fa4d85a6f6bce0f9/puwinuli.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eu2vuhr4skpsa1uprnfdai8svt/15380919770.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e07439eea---fapexotoduwamigo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf301f504---molakowewazekavezole.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ea6f57290d64e4d455282bed9d3151e0/litifonopepenis.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/82124264875.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/96889970274.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bakowiwoga.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/19623062634.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/dedukabeniwexizewifakubed.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16129252e7f656---50025061543.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/94b96219e0e1675451f7469ee6e804eb/sirizijabizirozolumovim.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/wugatimuremadetite.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ebe9aluvp38h9dqbqpr3qtcko0/82686416102.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f54a1fb0793152e91e306e96a21b6f65/83639075943.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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 17696 bytes
SHA-256: d943c583d9b7f9399d7a19af3f3506a478505c3a34e3f0e8d2c70ab61b05dd31
font_01_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 10596 bytes
SHA-256: dc2605d93b664d8de64cffd2e1773fc3a89a65f9eac7dd77546f72639337e24b

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