Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c68f1f0b265ff87…

MALICIOUS

PDF

91.6 KB Created: 2021-07-30 00:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8a5626e0b877cce4618f9b9ecbf360e SHA-1: dfe4052a9bbd7098d58cc6ae2163dbc3f2985e57 SHA-256: 0c68f1f0b265ff87575dff0776935594ebb09cba8803c8e5abb09fbaf8ed69df
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=candy+crush+soda+saga+online+game
    • http://www.tecnobor.com/ckfinder/userfiles/files/mogopatulanunubupan.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/zalosubij.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095564927067---fenilifeta.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/jhu3cgk9t2o51916f0l2tks382/18110982611.pdf
    • https://edubox.mn/uploads/users/0/files/pokibumoj.pdf
    • https://triangle-electronics.com/assets/userfiles/file/17334443893.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bffdc064f0---nujasawemirefijuwiniza.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hp0to8gui70urcqli8ou9j1c33/tuzodefaxozixogewozid.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4cedc3547f59b1e1ffaf845b656e9fcd/fotozudo.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa68222877b---jowubixiredepivebukujov.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/54df346abad2ae82aac360cbe5a2f010/43259833872.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83fc95f2e3620b8e210fa5aa6979fc57/10039157394.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3f7372fd---46408530364.pdf
    • http://firewheels.pe/userfiles/file/matulajezuj.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/370670063d4255bcfe9f50b1e2402b30/nosexemilugajepevimanije.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c63e5d78---lojejej.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608515262c8a5---piwexutanozomopedis.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0468a47a0fff2691d24606359e4d95fc/53805685006.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd7e158932---nenug.pdf
    • http://flyingcarpetclementines.com/userfiles/files/5817963331.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100487655f17---kelitepegaxulefupawalep.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b9148b533---rugozowiboxevovulab.pdf
    • http://summithigh75.com/clients/867147/File/1093221909.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/397943fcd8091c020ea77f677a464027/69560241588.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010102.bin
33d7c7b687153984f4e2a3111dc687a44b0b15b0377dc5e2955efee7e15bcbb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 10964 bytes
font_01_sfnt_off00011a0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 16792 bytes
font_02_sfnt_off00013220.bin
05bb091b44e2781392bebe9fca84470a61418f71f3fe90a9e3bf44487826c8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 17256 bytes

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