Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f63bfbab169df8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 06:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 883293904384e449bfc996973a15f8ac SHA-1: 916a8e9680d1ec7fb2566df3858c5d0e468117b6 SHA-256: b9f63bfbab169df8d62ee0e63e030a22a2e67f96840183924e5100845eace2af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with few links per host, a common tactic for SEO manipulation or distributing malware. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://garglob.ru/uplcv?utm_term=how+can+karyotype+analysis+detect+genetic+disorders+worksheet+answer+key PDF link annotation
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f20f21ccf89896eaa6c47c977458bc65/lawifo.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2c4a4fcf1e4fe57e2d70e4bf755d1c51/28335831644.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/jexifimotonagazike.pdfIn PDF document text
    • http://ippon.lv/uploads/File/gomutobalososuvefavabuv.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/52468976038.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qod8hlkjjqsbokecvd2php7227/rozubogusabubapeduge.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/31610987063.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607984ee6d079---sewapo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c5cebc6387d31c95863cd4a8921de6b5/65099435019.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/maguvop.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/xemisarowojovepipevuxitev.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/mirutibizazudigafolir.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e7e574437bfb2d414c188222994e40f8/ruropitemojusunixor.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/kkub0brfmrgmg4jgvucgmdsm7k/jinisunofeworen.pdfIn PDF document text
    • http://iccarrentals.com/files/file/70921669653.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021881141322287.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/93934741442.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160795f6e8b47d---20694589247.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7fe7bd1d0e1e0f82dcff466bb9ce50e1/25173403586.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1072617683608e7c1d3836b.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/41929562238.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6ab17436a86c46c7408d1ffe6411dcdf/63391694625.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/sewilowafonozagi.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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 11076 bytes
SHA-256: 45abae9376a02bf0415792922af1e795ec2deff2f893e6c08ad4022ebb71e535
font_02_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 18136 bytes
SHA-256: 48ddf82e7e8dc4a78acc3e452a9cd9e0d9c69897aa1cf91097735abcd0d4cd76

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