Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5297b70f0384ec…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 11:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b77818098bf7e3362e5542f15a00cce2 SHA-1: f621f5e8b936b3d1668a3fa5c0f68602ee712d5a SHA-256: bf5297b70f0384ec87e4af2139279544e8f4c7ed977cdd4dfa2740509b51aaf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains. This behavior, combined with ClamAV detection and ML classification as malicious, strongly suggests a phishing or malware distribution attempt. The file's purpose is to lure users to external sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://naturallabs.de/userfiles/file/60713522951.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/acdb671c441a2a4adf96a97235c7f0f8/fozajuroku.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a0046dab0f64de38c29a4e68a49dc72e/maxab.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/fotizuvapazavori.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/qn1lk5e71g0r02skddamo76hdg/34823326070.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a60fdc4e7---pefatavopufiliz.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4e002ef1---6620033429.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/koletidejuganufu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3ba34e4a8---midobolame.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/58103772112.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/1869917587.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/62598600414.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kq2kh0nshpo2n3holrdtpqrp46/25614635808.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fc22d521de95672c87ae8637d44ed9f1/29919421579.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/tiwabisenalixexon.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/dobibakilineta.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65315beca---50479390663.pdfIn PDF document text
    • https://norservis.com/files/files/jirul.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/68750213584.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fixupunidora.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a264f4a499b---nawaj.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efa129012---sajew.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/gapes.pdfIn PDF document text
    • http://afslab.asia/upload/files/newoweda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=secret+santa+template+free+pdfPDF 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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 19276 bytes
SHA-256: 214cf501d8c9568a707bb0369c7f374d82732567178a327179e69bfb94bf61a7
font_01_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 10644 bytes
SHA-256: ac30c6415a503a4ba2fd4ae874abc2fdebe54344f6439c8aad213327a9c9eb82

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