Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23195e5e2e5368c…

MALICIOUS

PDF

191.4 KB Created: 2021-09-05 02:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1a578d799cae6da2caa23995a1a927fb SHA-1: 1bbf682791f3c9140c9249818af17d1daec13c59 SHA-256: e23195e5e2e5368cc87ba463f13e2b2ba32f051533c8d0855d51784c17237dd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=storia+della+guerra+del+vietnam+stanley+karnow+pdf PDF link annotation
    • http://cayxaotamphan.net/userfiles/image/file/towufajagipifegogutubukog.pdfIn PDF document text
    • http://dentali.cz/files/files/zakowekubemeroresuzabu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf56357f15---mevajusakuxeru.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210626093011_m5l19p.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/65998177366.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b90d6b47---85949847214.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dkpkhmhic9jumcodnsojjqp5k1/19066023886.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/koxitipezifa.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5285b2a84---37625045952.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/xajamevazosifoleji.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0k8uu6e04oodhd610gd2k4k3l7/51852302546.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a2a9f72a2f92e821982b8445bf16aee/62708505340.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cee5a22586e528a3e711679a61fd3371/39924254538.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/vuxowome.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f009ee2cb6---rawefodibon.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dm8idmfklvidfummo0jsl8n17o/taveweributab.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///wukagukibaderagofi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f964414dbc---25544264865.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16121156d57881---paripakigufikebuze.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/85148647538.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4856b2e3e---54407096068.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/90448810067.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/begipopobu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xajevuberufotiraxabok.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_off00028033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28033 11376 bytes
SHA-256: 06fa57fd5d7a8b1b9fe498a452e184c0910a2c0dad8fbedd24b261fab0fc38a3
font_01_sfnt_off00029ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29AD2 22756 bytes
SHA-256: 118110ad5ac85ecec09e12c83502917bb0492ce6471dd5e6d87a6e037ab292d4
font_02_sfnt_off0002d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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