Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f24645a6ca10ed…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 14:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 757ba9ff128d4f6d7267b0afa0885bd3 SHA-1: d0e1422e0dd58ad2cf0c30253e60f99d8f9d8c87 SHA-256: e6f24645a6ca10ed18b14e0b82d82f0f5a347ac813dc8fa3d3542cf516415c1a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to numerous external URLs, some of which are hosted on compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or payload delivery, while the link farm serves to obscure the final destination and potentially spread the malicious content across multiple domains. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ipkameros.lt/userfiles/file/42810355529.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161324d15db90d---53194764954.pdfIn PDF document text
    • http://belovosushi.ru/files/gofovotovow.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/56923914683.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/pozexepinot.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec63f389a2---rubanape.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/bomapozubas.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137bebe286ce---nudepimite.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130af1ae9b32---dematovaw.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/nanideli.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/97033538030.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/furuzowufepesemoka.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/00fc5307707477b0139b1076f1884c74/32455055166.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/90978059283.pdfIn PDF document text
    • http://prompol.com/media/file/sesamezow.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/nafulavedesowomoli.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136511311e9e---faguwezazazupiramug.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f3qsahtruirna8719c72cs7iks/vopinonizonidakikod.pdfIn PDF document text
    • https://inks.bg/userfiles/file/80640582141.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6a8785eeb62e17601a24f550e2964e62/zedanakexi.pdfIn PDF document text
    • http://fpole.ru/sadm_files/78400724166.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/fozedexu.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/71660785984.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/57640825028.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/49895578117.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a470a1269---61268142919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=infatuation+scripts+ebook+downloadPDF 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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 10984 bytes
SHA-256: bb934a9d59de6fde494343fbe745d2fd47f53fa89fffa02099befa49c1abbab5
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 16696 bytes
SHA-256: 0df78510cdcbedc1778853e1fd0ea5b5b5f789c17a3afca827decf78ebc73473
font_02_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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