Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7071f5fa6bfb9d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 11:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72dd8e6ce9e12183ae0011e273c94d2f SHA-1: b9ab0f0811b60df45450f602242a6480816b51bc SHA-256: ed7071f5fa6bfb9d85a731ef6c5a493f4d8e00d0745756e6714d6909f05e3c9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by the ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=gender+equality+in+sports+pdf PDF link annotation
    • https://interior-mark.com/ckfinder/userfiles/files/40601437039.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5c169e0d199fcd903595f183daf20da8/fetep.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/gb7947esldn2rinegqpt36q9se/89916259222.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/90920045280.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/pepizisefudenotuwugoturo.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kigenigupalexufezol.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/dodozevi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hm5qeq86o1f585a5aeivs9m1t2/28655273241.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/4365013603.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/85101193445.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1823de3fb---savagir.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f889a80d6ae---24435189975.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zudorasajavitufe.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/zuxijuxijaxomevotadujur.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/048e3df9a9cfd356ecbd5ccf9f24d0b0/zodigigemapepeno.pdfIn PDF document text
    • http://short-story.ru/upload/file/zevatazej.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/de3af4e7685fc915d4fab47a21b3fe9f/43908009406.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/mevofeseseka.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/wiliputipekanerawag.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fcea893b---wabepesajufigonik.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/607b06ac99366c98d39b2542ad110a03/segixa.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/32141459861.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dfa80dfee9669a91c8b483c54fb62769/93539088869.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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 16572 bytes
SHA-256: 9d566bca85d0ec07dcf03e41da9be12b8926dac7219f5b785a69643941e2a73c
font_02_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 10892 bytes
SHA-256: 4b4e4c0067e41ddcb4696c703afcb0e2f16b2f2345808c1a4678dd7032bc6a73

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