Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b66938d8c6047a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 03:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f56e6c11823b4cde4f5ac7615c6c765 SHA-1: a19f5b51c403da99000deef5416c129a198f623b SHA-256: e1b66938d8c6047ac28a2f959cf6a3e891fe9a99cf173d186e1b1cd71fff6bff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://cpspcb.com/uploads/files/11783421441.pdf In PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/37201612107.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/wuropot.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/40740168870.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/qui77ibr92i6rtgekma1p67q1g/sajedamopufemevazoz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3960dd0d29---99232327917.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/52390884334.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89c723321e---34187637513.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/zevejifilimejaremabe.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/27095004372.pdfIn PDF document text
    • http://a-pluset.com/userfiles/85978626928.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/dekameledagejidisolaxa.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/68374627715.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/butimixifajemet.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc7055af5---3193894924.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/girim.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7a3b9804f---juvuridumed.pdfIn PDF document text
    • https://senegal4d.com/contents/files/xogesaxox.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rikizavajuzozizibatot.pdfIn PDF document text
    • http://gro-felix.si/uploads/54537508232.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/gevodezesipazibo.pdfIn PDF document text
    • https://koratspring.com/upload/file/20674967740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=onfalitis+adulto+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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 19088 bytes
SHA-256: 5610c264c516a532c37697241d1d2d9602582faab15e4982c7c777b8df8da4f3
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 10384 bytes
SHA-256: 9fb5ca8d195aafa4419b8d1890979612f03ec2fe1207faacf7dd3b35ed299821

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