Malicious PDF — malware analysis report

Static analysis result for SHA-256 c596f4afe39fa11f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 06:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 82146dbd8c580e60d42387c31031d986 SHA-1: eb7e6402195a52139083de21f186a2ddf1baec18 SHA-256: c596f4afe39fa11f388d80734a36ab3f21dce3986014d2a2b68464cce1464b86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wtmasonry.com/ckfinder/userfiles/files/47452146296.pdf In PDF document text
    • http://shqinze.net/admin/upimg/file///nowegarexoj.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f0ea8ed6---27313752437.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cd6d522e7---fabotisabupetexitomadarov.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/vewinapedalafebefodomim.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0f6623a3---nojerarut.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a962f1c9492---votuwodese.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3430f888---wekomojuniviwozapuvoxup.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/roluvatukoru.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sesezitasipeturizamesivu.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/73113063834.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d379a7830b81b111f6f34b75be402579/3382739650.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c26846909d3---wamuve.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/86580213100.pdfIn PDF document text
    • http://ativn.com/upload/file/56711230240.pdfIn PDF document text
    • https://zzhqhi.com/d/files/74356619554.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/71171503709.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/21172665102.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xorigofigujik.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wixuxedalipi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/pifuwibu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd8ae4913---kewejatawesijozilavidikot.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/banuxonukomemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=an+inflammation+of+the+stomachPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10480 bytes
SHA-256: ab78256c88ff86be4ec6d285838e5d35ef1bc304da19bc7a1480f433ddd500f3
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 16596 bytes
SHA-256: be18f9b4c51b8526e0eb4ab4e9c36d42dabbc463770c5c686f7087a6fe3c1bbc
font_02_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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