Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c510c84042d5b14…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 12:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7abc3d33e85f99affc55078383eaf03a SHA-1: 0d1d083b3b781c2db2f16f29c49572784e3528bb SHA-256: 0c510c84042d5b14dc9695e087246d3cef5469669cc757b9cc8298d56095e764
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.barbazan-debat.fr/ckfinder/userfiles/files/ladolij.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/52bef15f874496d2f736b5569f42efec/xibogejis.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zubitibotanu.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/59043092896.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/19406200429.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/68lhtfkr3hg3i0e74dhrs80qv6/24380920773.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/fijoxejuvin.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/nosemanab.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/73872965156.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/47809697745.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/goxatujiva.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614406ed67357---68181620852.pdfIn PDF document text
    • http://elma1.ru/!upload/files/81534400951.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/95326050593.pdfIn PDF document text
    • http://punaide.com/userfiles/files/nagewagizezoko.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/17610057863.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddee3455d8---57254498445.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kasusigematol.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/wanotexepafisubidotasadof.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/70040565456.pdfIn PDF document text
    • https://kiptep.ru/file/92392011056.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/96803107170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hero+of+sparta+psp+downloadPDF 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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10476 bytes
SHA-256: 7ad96ed1c26053ec11bb51c3322b315223a801f711cbc67024f3c15ed6a5aba8
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 18380 bytes
SHA-256: ae27fe637b78ea1d4fac8f67cc7a9d61a6f1cc60a40c5faba7b13b40c49a0862