Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e602ecb8dc5fec…

MALICIOUS

PDF

76.6 KB Created: 2021-09-24 07:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d94b44e614b851ca794273da3bd55828 SHA-1: 398bbcbb88eea69241551f6f025921ef53902146 SHA-256: c2e602ecb8dc5fec7c8bbbf3251e51c7e05b097c0ddae6c039e1286f4be81de7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=best+ios+horror+games+2020 PDF link annotation
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/xadefupajadopinedebavanuj.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lv10vitig9bpcpimi1h7o7sl66/66897685345.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/mitijojiwekixor.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161432c645a00d---69134036638.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/vobofusabogubinovat.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6bdd270ec---92351363553.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/maliwoxujuzenuzizofurudi.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/i5l78jdvd3oe97tqvj69tk07m3/doruxowitokijom.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/bojunewudujixipinob.pdfIn PDF document text
    • http://lilcash.com/ckfinder/userfiles/files/40856890939.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613034007b9d7---mododebibabegezazeteb.pdfIn PDF document text
    • https://flomogroup.com/upload/files/kovekef.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/bosorosa.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/56538959391.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/18460272662.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/97472499898.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614920212ea6e---78621099759.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/64345048191.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/pujibibobon.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/41056788141.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b01b92c73dad626b943d7e7393c16708/toguwurojise.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/70664528031.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_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 16528 bytes
SHA-256: 31be838c26679f69f17597d90bbff34cafea02c404cecdec6ca645c31b36c989
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10700 bytes
SHA-256: 043cd8ed49637e7ffdd73762de4b76988c2791553f536e190f64bd2bdb38962c

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