Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcda604d7af081a6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 12:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 684c6dce292fb8bfbff1d7213ce33c4a SHA-1: 0525c1aff8c35015a1a8d06245ad86498c2e045f SHA-256: dcda604d7af081a603abe4464aa711f4cd473e39656433e6d4e4f79d4f988031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various compromised CMS upload locations and disposable hosting, suggesting an attempt to redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://equinox-e.com/upload/UserFiles/file/94322491529.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/k91tnpdp7atl9fop20odq3ppm6/65970247833.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/98683183911.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/21388093680.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/363c0c757b7af83d099e5fb55f27d6bc/90110384846.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b511e009ee5a15a44c68b87c365cf3af/63078992860.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1b36acd44---kubutivet.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/12484854471.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/80681489358.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085c84e98b7d---5726829189.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/49161303060.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/nekenulu.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/bafevofotodapolosunupox.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/35182395506.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f01f10f1---kesogeza.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/9965997266.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d402e6183---fufinitimajelijin.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/38966804629.pdfIn PDF document text
    • http://teraval.cz/res/file/19433799806.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/boxus.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/56075654566.pdfIn PDF document text
    • http://cuiquji.net/d/files/dasakezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=active+passive+advanced+exercises+pdfPDF 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_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 10596 bytes
SHA-256: e06214df0c1777b17068382ffd90f733b686daf507e61fe636e8ee11c72f4ae7
font_02_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 18068 bytes
SHA-256: 588a822f2c1fe5f4e5229dae7c6da1c56b125fee7d43f973f79a482bb586cdc3

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