Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b651bd1dd34ad11…

MALICIOUS

PDF

76.6 KB Created: 2021-06-08 23:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c509d9864b4f90c5b690e3ba9ac54f2 SHA-1: d80efcd455d9b6197b83b615544974f0cef80347 SHA-256: 4b651bd1dd34ad11b957550c3e72ab6e48fe8c1f35076ad06bf77af0557d6f30
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=adverb+exercises+for+class+5+with+answers
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/10577e5c79e5209aba843cd828e8b84c/56120853773.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/6d2q350utomkk3tqd7piupabuj/94345777172.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tf46a4o7bdolpcvqf5i8ullmj/fewaburasaroz.pdf
    • https://arvikabc.com/images/uploadedimages/file/13592060953.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8e7dbfe78d42b4dc218e453eb5652b1c/konasala.pdf
    • http://eprdel.cz/userfiles/file/43387860296.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1722e82ec---zimesat.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/756cbc2515e74266d2e0f3c77d4ad9ee/28545700531.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3f3cab90c0a5e23638d66786e8d14132/lavepifura.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8a4a96ab---1050405193.pdf
    • http://wadirumshootingstars.com/userfiles/file/%5C/selirigisovovini.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/gajikow.pdf
    • https://abofahed.com/userfiles/file/jovemi.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072648b5169d---vinatesomo.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/72705199598.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9da96e88---padosepujijurataviwojagov.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55f1697c2---31938865415.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca4.bin
7535b9342bd01f3ad61a9ccb9e43166c7ddd24652e6be7a0e6d1bc638e836b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5580 bytes
font_01_sfnt_off0000ffb9.bin
abb5747f77e1f1ec9d7bfd93ba1842c2d86529630243112fae2b4474de1bca2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 10964 bytes

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