Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e2b20aa05dd52b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 12:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c84d7eadab80b9d3843c79448e673ca SHA-1: 5919518e31a8c0970940546ba9c68f07a661b598 SHA-256: b5e2b20aa05dd52bd7c3304434dace9e772c7c1d43a63b55f674852cff464f22
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, specifically using invoice or payment-related language to entice users. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to deliver a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1c669321---vugukosilajolu.pdf In PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/jopowuwumebikajadopila.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6o015b51r269j2gp61leadjvej/45505532275.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/bawojezebamokaburotuxel.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a6439cb1---jubiwevidiwuf.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd01b53ccc---43026590954.pdfIn PDF document text
    • http://kammed.com/userfiles/file/dimufefirusonaxov.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608124e4a1aab---14910354813.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd92ad38e---90609447613.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/redarezarosa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c77f56f53---boterosilutefesiw.pdfIn PDF document text
    • https://proxus.nl/file/niwumokow.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/sizetunuposexig.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/29375420200.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/43640452648.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/98529855967.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac899ac9b8---14866185545.pdfIn PDF document text
    • http://oddluzanie.net/userfiles/file/juwuwefazupeves.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f9dc3fa73c091909b6bad6c72e61ad0f/sinapewagimegiralawikito.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/25531564920.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f854d66c76---41141774029.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f5b4055a8b0ad6e3aff64fd7bb644906/fabafukorinawixojepaxez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sbi+cash+deposit+slip+in+pdf+formatPDF 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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 11100 bytes
SHA-256: 0267aba52cba710fdf84936338e7e52a545fe57348b2dde5cb6ca3c0f6ca7235
font_02_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 17708 bytes
SHA-256: 45770fd689f409356802db3dd7b7a84da2a554c3fcc9904aa9398afe7b58335a

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