Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b6bbc8e4b07615…

MALICIOUS

PDF

92.0 KB Created: 2021-08-20 07:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5cbb4d3291df1ba0ad6ae78daf1accb SHA-1: f3a8e6fb7ad7257af2f35762799ad1a691a25d43 SHA-256: 67b6bbc8e4b076152399b12086a3f4ed7b23a8fe982b8fffa861e8f756202c05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.cerathai.com/image/upload/File/11280595727.pdf In PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/giwinemijomev.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba14ab0cffc---59682503026.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608163b05dad8---81894451166.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/56521390932.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/69936795268.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/68af9d0dba0bea53683c4736ba1d06af/muxenibefomewefule.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1015b651a3---24634856473.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/f9aeb129e566b0df5f8f65bab7d695fe/weperatidojovojamoja.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7855795617---sonorupabaru.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bc67e1a876f---gabopabun.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/33203902207.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/8860285773.pdfIn PDF document text
    • http://ahchala.com/img/file/vefitomudi.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2ddc42ca2fced4fcc640b0ddad63142f/58949216789.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/nozumob.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0829b553db---bolopotakizofadusi.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/46541585735.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/19680402415.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/galetuvapo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dae51dfcf---62428494096.pdfIn PDF document text
    • http://seamacros.com/upload/file/59954612495.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/kagetafunopemixosofidig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=el+coronel+no+tiene+quien+le+escriba+resumen+capitulo+2PDF 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_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 16984 bytes
SHA-256: be0293d8884e84acc673fec6971783a20e7da807b65b9ba4c81a3bcb3c02229c
font_01_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 11024 bytes
SHA-256: 297477d1923804d1f1b8c4f9e679b0ed71e9db481ee09e6a300068f63c8a5f1c

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