Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da6b114d39a9246…

MALICIOUS

PDF

77.3 KB Created: 2021-07-04 01:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 57b123fff646688ec6ebd05b634896c3 SHA-1: 8b6fded9e8c7413155c02adb4c882d9290ea9baf SHA-256: 9da6b114d39a924626a2d954d34fed8330a7e0082f236b5f6cf0b42b48073c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to facilitate the download of further malicious payloads, likely through a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9064da0959---gakupepuruvedagoju.pdf In PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/30187222165.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebdda4dd8c---48582713874.pdfIn PDF document text
    • http://thongthien.vn/upload/files/tumorufupuwijok.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/kanuvabi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/78561332027.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/zufezolumamoboziralobom.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/i2q7j3l2gdgep3mb3ibdc8os13/dojemogutevamubarer.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5be812c23---gazisobujonaxik.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/12a90775d2499eb3dbee6dac0430f172/nasopiwobenodosogaw.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7da77b951e---60519047541.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cadd0f26a57---koxojugid.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/lusipivem.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/velukinejurudomikato1624082539.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c758d06e54---13671096855.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ad8271cc---josaxomaremiboxi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080eed6cb7c0---zatogunowikit.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/borab.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/sonur.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8grc4tjo5be87q7vnkrepq53q1/rakikulosedeweti.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/demeletajodoroxopujikix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=architectural+digest+pdf+download+freePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 17192 bytes
SHA-256: e7b4bd23c5ffaa27e2f981dfe11134e8688967dabb84a9b13d6e78cf8c1ef755
font_02_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 11068 bytes
SHA-256: 1caa85450b2ee24db6560a4de1d7070e2bd267870086beb98d12f21d49e88c4c

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