Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3985b868ec236a…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 13:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa69d04dcdcc87b3497f54dbf4d9662a SHA-1: 83bea3b9ac5d872856c6f7a21bbb33e45703919e SHA-256: 0f3985b868ec236a9b26bc197242933158a66b04ff2f56e867d61a7c0ee4edf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the link farm structure strongly suggest an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://crysiq.ru/uplcv?utm_term=ip+ratings+explained+pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37cf2d9d27---55391772267.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/d1402ad5b8b2770336405715d5ea6322/ruravadasibilota.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb83c9d13---71984484334.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e20c51267---todow.pdf
    • http://uniroll.pl/user_images/file/lamiwejo.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3bc149a67918c19ae16bf83e513fc68d/rigusaw.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/136c7673911567751d36b34cafe6127b/40303416751.pdf
    • http://safeabortionnepal.com/userfiles/file/buludagaf.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/nozuvibiliwudifavubise.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb2bf5457c---vukilosito.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2fecfc79---boxubivabo.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d6822cb8---57207258802.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c830eb4f3f---549787113.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/rngkkcv3k0h33v7g8ggu3uh7vg/28835314278.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878fa31edc---84745741018.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/70840656245.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8g3hn59p4aq8djv0f1c6b9f9np/73137353636.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/96a4ac1d0e412443ed5309fd6887a0b0/tavozaxobopinefigoko.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b218367f16---61492185746.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/36ccff8c292498e0350b02da16e079b3/pafuziduja.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160970384d6799---gumezadubaragajokumutenun.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7d80ef8cc---kasatosozegafafexex.pdf
    • https://patriciobanados.cl/upload/file/
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/budiwurudor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16792 bytes
font_01_sfnt_off000105de.bin
005536cb04bdb4167cc58f263e234fffcd553a4eabdadc669fbaa8157a400994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10608 bytes
font_02_sfnt_off00011e03.bin
ca40a52e3ccf54f8b6308f6908ffacabd4023a398a807afe6ff906c6e9358c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 17784 bytes
font_03_sfnt_off00014c5f.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5F 1692 bytes

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