Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea640470d1c4a44a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 22:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 041b5a29a750a3d031bef72fb0bd6ef6 SHA-1: b755a28e4820ffe190503a9f1ad2836676fc50a3 SHA-256: ea640470d1c4a44a3cdd4ec37706046e006ef312f1a2d697ea5a8edb33d8d35a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=traductor+ingles+espa%C3%B1ol+documentos+pdf+gratis PDF link annotation
    • https://profipreklady.cz/www/ckfinder/userfiles/files/4751191509.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/ludeworijixe.pdfIn PDF document text
    • http://epmachine.ru/d/files/gibemimarorulegovel.pdfIn PDF document text
    • https://bamor.org/userfiles/file/reronopatarowugesefodutex.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/72095416327.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7cd95b5cf747440d4bfccb54ca9c59e4/dejozuluraguzaxeguja.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9887217719db61a4729f4f8c6e52d633/poziviguwoxejumokus.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/bunefazisako.pdfIn PDF document text
    • https://chp-travel.ir/data/file/regemanawivujatuno.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16110a76a3b0e9---1820758681.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zevubiwilifi.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/56394983167.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/98997817849.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fc2be9a2fed4704218ff537ff5b2f1d3/jisisegilobomoxugutom.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/29f37d70a6248ca97978cd48e1dc6021/23704336702.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0b719df269e51a24b329ba8407ecb928/38263884802.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/21838472848.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/57cc53ae8f476efe381137e4f56b7990/pukefinuv.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/83978562378.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/bazojexedexe.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/towotulevilunibuzol.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77c0eb6a2d---wepakituj.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/nolanomopezaxuditeros.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/49a566a014111c61aec9ef0cc61fb343/sitikezumafonolekojuwu.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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 11232 bytes
SHA-256: 81dd3844d21cf50eaa867f97bb24e6e1e7c3d0f621c50f3845d707956ef47173
font_02_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 17960 bytes
SHA-256: 6494b355107dfa2a6d7320965ccc6327fab9827822d8b37cfdfd30e6c17a7a1b

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