Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c43374c423e9ce7…

MALICIOUS

PDF

73.6 KB Created: 2021-09-08 19:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82072c91e3eb3c0d53b06b9db96fb901 SHA-1: fbe88e4d4563c1fcc455ce09de1cf099ea123d75 SHA-256: 0c43374c423e9ce794b184828e6c527afc50d1ed4191e9c2aec1158fbbca83c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=comprehension+skills+posters+pdf PDF link annotation
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/fuvuwekepuluwopuxudi.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/85857927060.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/dugekufuv.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/nugipifesatirizoni.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/najewenago.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-5/20210905034816120297.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c6c34e26b6fa097315d39e8b8f7bbd7e/63951336143.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4c4939d4---vunemudun.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/tivazitoxenujekire.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/97696215156.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/2383719738.pdfIn PDF document text
    • https://salwangurugram.com/files/3441160819.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2b6ee989---lipuxuzegizebavo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f0e517af5e716e4d8f9332b531526d10/pawefamagafapukijos.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/zaxeguzufa.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/794ace33d93818eb53eda3991661c506/goxipupupupafenudefokofax.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161366788c9fe9---dudisezuxulizexozem.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/gipogipepe.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/74573843587.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/51062441601.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/69739696819.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161387da92867f---72376009674.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/venavusokaj.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_off0000be77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE77 16316 bytes
SHA-256: 5c14e1e77d04ee48e8b4fced8d498cad32233bdb080cc19cf54016ea4373de71
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 10724 bytes
SHA-256: 290558557142406e652caac5bedfa5c2f5c7df64cae602c10f7da375556f6ee6

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