Malicious PDF — malware analysis report

Static analysis result for SHA-256 78daf2f159778c09…

MALICIOUS

PDF

87.6 KB Created: 2021-08-19 17:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ea917dc6b55221cce0d2a32fca523e3 SHA-1: 55d1b0d6e6b33729afa73c7c9cd11a614e790a4a SHA-256: 78daf2f159778c09555b112d11b4efd732eac6ca93475f7856607390754eb24d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • 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 http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/gimama.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/63e29c65f408b3fcb70ac5e43da13d89/ruwapidifumifujajisuj.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/16853082208.pdfIn PDF document text
    • http://webs123.com/userfiles/file/90527877228.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833ce46134b---94883618663.pdfIn PDF document text
    • http://agama-rc.com/upload/files/61094526096.pdfIn PDF document text
    • https://network-italia.com/file/64004117692.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210601001304-pedubuzemusasuxe.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/161052ccb5f34a---85735740216.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/93392268231.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/boxilupilaba.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fe70b32e4978afd7688fee6e15238ce5/51565898812.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fddeea2c5f0---92039050582.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b412b472627---26014661604.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983df231e35---lidabepovezaforijezuni.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/750858354bd2f691b7853d6b88db6732/77224246933.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/16726345965.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/75684830230.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3c5b9307---zimapojixubojogofuro.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b8ce05bce---zogopuxabetesipogigapixo.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/xatixig.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/28022c131b9fb9b23f578cbf93c3ed6e/livure.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/kujatidusupafidifigex.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6d8f31b5e71172037e7ff942c3e861ec/dovodadinepiteg.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc410bb8c2---65223111603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cuentos+cortos+para+comprension+lectora+sexto+gradoPDF 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_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 18392 bytes
SHA-256: 980699b0854445363e139d5d3fd73da355ca69f3a30bb94ec5cc6b2bc1948ac3
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 11088 bytes
SHA-256: 8a323d8397253c9acbe22c144d2e9a91358477bf295cee19cc3e62f904b47380