Malicious PDF — malware analysis report

Static analysis result for SHA-256 5407b6c2e3a3fe68…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 21:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7937d256377bfccf5d34427c0b6d0fb8 SHA-1: 97ef52d2ce5898ddd60b2feb5f0f3b3894a24685 SHA-256: 5407b6c2e3a3fe68360ba0a3091034ac96ac698b743717777126141ac93bd3bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://rabotatver.ru/userfiles/admin/nezora.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407aeff3714---gejizat.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/17017898826.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141459a425f7---pawejekanejategewojefa.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/felak.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/14843602963.pdfIn PDF document text
    • http://mq-water.net/upload/bozedozazoxuwinisigejomev.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/27326773143.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/39779513221.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7138cc546324efe63a15158d569019a5/69378262770.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/1251582303.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/vikebi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614956eb2d41e---xunufagovituvawazugusi.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/34419644910.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/mavefugameliwurujexesato.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/juginisenerupuwafuvizipif.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/tezifori.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/40743749901.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/13362203545.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/53009539231.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/ribanote.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/5577432039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=enable+usb+storage+androidPDF 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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 19172 bytes
SHA-256: e060a40a1d539665417e754c5c25f2dcf5d64a1ddd7e28d26a3697a18e57a5da
font_02_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 10648 bytes
SHA-256: 266a51edb012a8e2e9b6cab80a5d6d8a61b9061eee02795fbdd7ebcffd597130

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