Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3af343c0f6c2f36…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 12:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6143a9819297834113ac0ed3d7163746 SHA-1: 3658904ccb6df5d3955a28c22738b9b8bccf616b SHA-256: c3af343c0f6c2f36a29e21027a1cf727c7aab3576941717a8bc696d9d02fcfb6
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload directories. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://inwebjor.ru/uplcv?utm_term=kinemaster+mod+apk+free+download+for+pc PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143618a1b163---98104309988.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/tidagedelu.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gunuvisuk.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/jevudux.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/nozepewizagujarewu.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/zaguwup.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/544191364.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/76224205811.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613269b42d6a0---vimifosigerefigi.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/59726829395.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/garat.pdfIn PDF document text
    • http://gestioniarmatoriali.it/39197533993.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/89438040551.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/towomenaliweratuka.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/75870514493.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/jipegajitezikaniramowufo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/93138756348.pdfIn PDF document text
    • https://ms02bet.com/contents/files/fosasuvokerer.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d749018c98---kupewunonutuk.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/52437396286.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/64302073396.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/tovowagojaxovizojizugu.pdfIn PDF document text
    • http://orenprom.com/img/account/file/gogoxaxojizubefofareserom.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_off0000af47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75E 10948 bytes
SHA-256: c0080c8d46562e644a459c718f115ede9de42b82b8ebf8b63a4569147be70e46
font_02_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16316 bytes
SHA-256: 68955414b662a1cb468165e24eb742eb95d8f1f0fb9766125e2325173851fbbc

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