Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8eb4e6c6b33f5f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 01:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdf3c0cbf02834230825e5e67581d94d SHA-1: 0732871f267611aaeb65c7264c18eef6c0617f08 SHA-256: bd8eb4e6c6b33f5fafc21aca47ef2a50af811c4c41c8815e048cc957ed3a72be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fujiya-la.com/uploads/files/20025583663.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/novulurolo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/36107516817.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/77278419741.pdfIn PDF document text
    • https://chp-travel.ir/data/file/48050546256.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/werifilumolivirajetomoru.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24bebdbba---vizazejujijemirukavujaz.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/merulawonikugi.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/22320244674.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a98eb4c7bd201d07e3e0d60ddca0539d/guvifonenefitigor.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/52306550698.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d35faa6c7---282201795.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/11803530785.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/42765502182.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/sogumab.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/fezazikizepinuvodefisexa.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/711pcmehv4f24rtm9hs02kipn1/jusim.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e39fe3f24e04786ff0ffaa958f5eadb6/45813291408.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/777ea6a0285b93ee7574939eed45a8ba/15341395591.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/79b0335592000057fbe7295b4a9f485c/lozobid.pdfIn PDF document text
    • http://servmed.net/userfiles/file/5093901129.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/tajuwuxovexawidagareke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ayuno+intermitente+pdf+descargar+gratisPDF 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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 20404 bytes
SHA-256: 8c8e4a5b8e42f62232f3032ccbf81265add3d6f1b69968f8b5d6e4b586e22cbb
font_01_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 11112 bytes
SHA-256: 9c4948074c79b2ee5970a0249ef10bafe6493a5a57fa9deff53d301a3585c3b9
font_02_sfnt_off00012818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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