Malicious PDF — malware analysis report

Static analysis result for SHA-256 e906c13bb2c6e676…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 19:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 676654c16d604a11db4661a46ad6d5af SHA-1: ae51ad114bc77d83075ff8828920ab8e1ab2c272 SHA-256: e906c13bb2c6e676edf820e94ac94ed40b08df4630ba0ac93c1b4daae2f246d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://oniceh.ru/uplcv?utm_term=top+tv+show+theme+songs PDF link annotation
    • https://steammining.com/userfiles/file/19136943516.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/98085545231.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5b0c0fa36a842940e1da8a1c7a9b1327/35398927774.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/tobolof.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adbb2066b9---powivusufop.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/dapijujunonukokesonilutu.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/fofodudasi.pdfIn PDF document text
    • http://telecycling.org/files/file/43481227627.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf3533ae74---74535245466.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7fb149eda---vatavegugosaw.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/23852123191.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f570a165---talidajopomudo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c379cb1663c---rovaxaponapadowuzema.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wafalitikutaru.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16109cc113f40b---87036147671.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/0d2f907c47908e5742b1ab6d49af4e02/demopafigapagezi.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/55002814232.pdfIn PDF document text
    • http://pk.mo/userfiles/file/8016906835.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d96fa0bfd---68795573660.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/29078164087.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b707ed084c---86077699075.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/1704185504.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/67960318943.pdfIn 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://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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10416 bytes
SHA-256: 1685f5bc47254bf683303e16fa87fdd89d821039ec7e4c64239ba2d8a7f09433
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 16328 bytes
SHA-256: 9e0e69407eb7591ab2289849c7eab397a7ba2856c911dc0d33e5cfb491141324

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