Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeff74d1d3683b79…

MALICIOUS

PDF

87.5 KB Created: 2021-08-19 02:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dab4efe14b94a873934216fb29a1a51 SHA-1: d336ac27dd0940e90d03515216a890b846d4fc63 SHA-256: eeff74d1d3683b79e60b2fbe716107f4db27f5873ed0a945332e4c2cfbf090e3
164 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 threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdb5a8a22---lamijogenakejasazum.pdf In PDF document text
    • http://vizugy.hu/uploads/files/wekijexumifewoxiweb.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e85ea7c1761---fanupo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/407458953bab585341453d2cc45dfe8f/25529943254.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a264f0c0252---59892780280.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/pekefonigujokejekibuw.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/33765285063.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/fvr9g3lsut7sl45p8i96bbqcj9/giwovilikobon.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kodupazuzawul.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb9ee46874---78899171019.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/64086554482.pdfIn PDF document text
    • http://miguktour.com/FileData/ckfinder/files/20210629_7781DB24B36A386E.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/80113224410.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/patubafowopav.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0daee63647652a1846949cd302e5471a/wimen.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/samunetojatom.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/kaxexejemasosedozekesela.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0922cff19b9c8da8a1b4d1a86f93b8c8/jalumuzilawumoparog.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/defimibunobimexanu.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/68470366480.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/nebekerokazonejuvekima.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024c2161458---xusurifajapomobemi.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/70306418895.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/wubirezi.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/59271515112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=muklawa+movie+download+filmymeetPDF link annotation
    • 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_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16876 bytes
SHA-256: 4dd3b649015f58da34699720c4b14b9c725b4bc4804e9c3bbf90d8cfebb9c7c4
font_01_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 10700 bytes
SHA-256: 697fef958de4edd9c5801097055adfff4990c8dd20b1ff2ae65b01cc31faabe3
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1