Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bcfc8c0b0fab3d…

MALICIOUS

PDF

83.5 KB Created: 2021-06-10 11:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8b89d65bdd734618ae08a947df3a952e SHA-1: c84aed7a231a04d41bc079c9949eadfa1b81781c SHA-256: b0bcfc8c0b0fab3de3fb7e7694af025e0fcc8a4985cb5ce84e7664be73a0b7f2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=sasa+marathi+song PDF link annotation
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af668c7ce2d---tarekivebitegerane.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/37545475235.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b986c97e2d9---50264408976.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a3bef85c7547f90270d0ea752416231d/28215399792.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6a7a58ec5d168c3315621da840b90d6d/vodagex.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/634d5f9d519bd945bd8adcfda8d86b29/togidimisotavevujo.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kiwemuje.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/86e7391158e9afd52f53b5b70f5d2b15/jorepamivumu.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/nogomopesan.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/8aed48a0b9bd29a1f85d10bd08f3daac/84626918059.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5ac784a4---puxujavojoganewejevivusu.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/pevipitozilelexiveregapu.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/wokebenunopolobi.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/v2nkmipea8ugpq4ae9pnqqf0m1/32809675803.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 5172 bytes
SHA-256: b2132adc524a992fa99193a1efd62fdd367cc175e05088b92d2fa576611ada2f
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 11048 bytes
SHA-256: 5cfe3d09ae881560eaabce4f32a00067c6780a2645ba1cdf409d0b407b31825a
font_02_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 9608 bytes
SHA-256: 81f58d2658ca57f6eaca39f2b8202a41fad95e33299e5b0313162eb4743ff449
font_03_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 4496 bytes
SHA-256: e1e8e4cdfc09d8edac9ba1e5b0ab62ea357092c536928e119da41e80c6442324