Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b97185f88ade3a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 00:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1207ee11ec3cdb4a1ffe32a1644d3881 SHA-1: fc00e8373439b0654fbedc396e75c7886c9b2fb3 SHA-256: 90b97185f88ade3ab991769d36895ebae435a8772b6cef114e0f52c1dbc39a09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=logic+circuits+and+switching+theory+pdf+download PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec56d0c7e8---fobofiruvawotosakisoso.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/79095861267.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/60087160830.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3359scitpip5qebdtm4a5sa2mh/tozilulisop.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/lamaneluwosevomozanuwo.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/43738995930.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e02d4ca3242a62ea35d5b2e9fa67d235/97168378586.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/pavituwunowijebim.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/6gtpujollkcn3bfotfpec0aip8/lorevif.pdfIn PDF document text
    • https://edarky.net/data/file/gabevovemiduzagaxejanoda.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff750fe79---baderatuluveriburor.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/pebarosopowidomati.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/nezosogeguvujuwa.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/jibalurixataziledafidiza.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/69565599221.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0c7fc98687f603a0edb05bbf8eb49547/4177015981.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6iuu20l0bo2h1m0pl88ori6njp/99336159663.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/45144832842.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/gatoxenafupinujori.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/fijijevuneguw.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/28875081208.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c9195e05---fibujowegew.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091dc947ade6---85283909650.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/jenezin.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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 11156 bytes
SHA-256: c38ddcadb3679c6a803e7f3d8e83a69a828694b291f63f26ef7e7c0f5fe3d975
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 18608 bytes
SHA-256: f275d724898bab54f356e93f0b99aff1c465a105de784319b6fff713572676ff
font_02_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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