Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb87204947f4baef…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 12:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1abf77433a5cf0f07d2a26bf0b27859f SHA-1: e46be8bc796be13d94fc745d42951ee21e9f9a16 SHA-256: cb87204947f4baefa48e18261a90a72aa9c657e8cca306a0d72ac72b850f2bc0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=bad+effects+of+coffee
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738974138bf---vovekaniredanudugewufil.pdf
    • http://www.sport-konyv.hu/userfiles/file/nugirenutizosululatexizu.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510ddd2a8c---95823544086.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3c65afd8f---87930532910.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f7ec7ff4---jokabotoze.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/powetokugojuputebugew.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a8309be3fd28c8838d91999e75614a8d/2199107675.pdf
    • https://alshaabcoop.com/userfiles/file/viwutifekamebere.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe00678f85---zokigu.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2104f18a95---devojexufawosari.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7655efb6---wodalirof.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090562865ae6---nudafasafavozivi.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff4e8ac93af514cb631937ddf5dee5db/wupivilikabanepemireti.pdf
    • http://altinay-law.com/images/file/tixubirovegozimojorapinun.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65a2121205---86304869962.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/epg4qplee4n22ng5d92dbrl88r/26536410079.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2224217e9cc0f339ac13eaea26dd6068/36954114453.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/09f2c1aad3d9252ee5a5d264570ac642/89269481338.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fb0652a6e540a030c80946a28400ba21/mavaroxuso.pdf
    • https://aduanaldelvalle.com/userfiles/file/xojamarapavuv.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608343a516821---28856746649.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608360ffd1ea8---98098356773.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_off0000e8e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 16792 bytes
font_01_sfnt_off000100f7.bin
4cfba3b26c72b5fa2260b6513cf9dce38e434f923a43a933faec722cae1ffba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 10180 bytes
font_02_sfnt_off000117ea.bin
d611d19b100979133e76e93f6ca0e025a6e7fa96baf8497b42283fc01e504205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 17632 bytes

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