Malicious PDF — malware analysis report

Static analysis result for SHA-256 5133f09df80dc6e8…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 21:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 338c9da8ab41bb2823878e353847ab74 SHA-1: 68f7bb34416a577fed6722275029e627485d9a87 SHA-256: 5133f09df80dc6e8e2219b60bf0232f6d400bd9814633eee63486ec84224fc5e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing embedded JavaScript. It presents a deceptive download button and includes numerous links to compromised websites, likely intended to trick users into downloading further malicious content. The embedded JavaScript and link farm structure suggest an attempt to exploit users through social engineering and drive-by downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=thappad+full+movie+watch+online+filmywap PDF link annotation
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a07a7b170---mupopefobufefok.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/madilagikoluzotefidod.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e41ecb9240cb3b12b15e8aa8e79bfe2a/66318740590.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/toratigixipujoxim.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/ratabewe.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/86721491165.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/713129ed53d9abfd662f83ec08908d6f/37964108772.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/vupesefulavukedezata.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/kugitivep.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/tevidupikizuju.pdfIn PDF document text
    • http://keramann.ru/uploads/files/raxeruxiluretakewule.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/69694063323.pdfIn PDF document text
    • http://greenld.com/userfiles/96231564193.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/96989483540.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109062136509810.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8a1c01d90a0a22c3a909827358db0bbb/rapowigoviropuwaver.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/vafofepefoxutap.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/bidadunozomaguzisi.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/tobokumegujif.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/disezigifuvutuxinopururi.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/xezunusoviza.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c1ddfaae---16367811534.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/32864224404.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22b8caf9b---repozosej.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/govivuxumiziropona.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d89e8717a---42018441565.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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 18672 bytes
SHA-256: 7cc16c5bd74bc71271bf310fbf4703f3440bbdabd2d77bb6d246af761b8fa914
font_01_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 10948 bytes
SHA-256: 2c6e4acfad4b4f11d0357ed331761cdf00b720a7f85224109880731868e368c9
font_02_sfnt_off00012bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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