Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5a3a63e723264a…

MALICIOUS

PDF

75.0 KB Created: 2021-05-30 14:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8a6d820680fb5f0d7098a06e2dcfc5c SHA-1: 569b0d2134e3c60498258a4e0045b6e5cf8175ed SHA-256: 7b5a3a63e723264a5e2eeb0e55a79e6e61237245eed3f0de05198082148caa8f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://angelcabrera.com/FCKfiles/file/43890674034.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/jeh066a5qj0gjhoj0ov02ki2h1/66794714505.pdf
    • https://grandplaza.bg/uploads/assets/file/bawulapulonemubuxu.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967e0b9b8cd---13416951426.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a949f8ee0d---lizorojomagugexibaj.pdf
    • http://www.aportecnica.com/imagenes/editor/file/viwoduzuxopefexog.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb550f46b---27163122739.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8bd6384fe25f5d72929c4b151c9c7814/virowagapumaradokiwawum.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160954b109cc30---nupazunadu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca3e95763---vubuwolobeluge.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d1cb1828ace669c96e770863dc3df3b1/noveselefugibevi.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820af6884e2---kavav.pdf
    • http://hitecds.com/userfiles/file/37873138851.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2ccdfcb6404b40013589f40653f6431b/nezetajerexev.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3bb99f34---tivakurenelosabuwugigagos.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42713312f---94255484881.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/a47obh2u9oqnrm35d6ktobvmee/63365515923.pdf
    • https://tavio.ru/files/file/66168953654.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=work+and+power+practice+problems+worksheet+answers
    • 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_off0000e6ab.bin
f9461bcceab51ca3dffc6d827dfd60df94dd36c00731ed2c85f82b9f4479935c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5624 bytes
font_01_sfnt_off0000f9b6.bin
616945985c61fc71a7cdc804cd2a28930c0b8c0b92d43c357732de1d888b685f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 10908 bytes

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