Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0be04287cb38c72…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 21:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 190d95fc4e2f03c391e07a3a845b222c SHA-1: 9b70af8d84a5719cf8dee3d9e76cf1e222fc0a38 SHA-256: c0be04287cb38c72a65587a444f0e86c8f38c4f12b97224fd75b4cc828b49efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. The presence of external URI heuristics and link farm indicators points towards a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=nissan+x+trail+2007+service+manual+pdf PDF link annotation
    • http://kingcraftviet.com/uploads/ckfinder/files/gilaxepuwaburapasarukipa.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/norifazizuvapa.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/pujonipejur.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/s65kvp2mp78igpq3dcf7mccklq/fopedubevoji.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845ad47aaa---54472042328.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/nisuluxunabotixeju.pdfIn PDF document text
    • https://naoshima-habitant.com/nepuselaxubanipeno.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6de135128---rofewub.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/sibuzulorugiv.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/74bee7049fca6efced95193a10dffa73/lefenuj.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/nibotezagofodofo.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/molakamofop.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/f7uef87bjj56flonip2ul51pdn/89552843344.pdfIn PDF document text
    • http://deauville.ru/files/file/watatetufapesabo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/goravutukakelofibawaj.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/kapoxu.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/18473873992.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/40143865062.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/bff17816762dcb1e2e7add40c189976a/xaxanenonozotukuwako.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/91631279989.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c900a624---jedovude.pdfIn PDF document text
    • https://wsbtitan.com/images/file/livutejemuruzasideganobo.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/lopafikifonozinivusogexap.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_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 11200 bytes
SHA-256: f119b5fa668d56836d7c1efbfff7ff5e3a521b50ea8c4bd1a5d8d84dcf8a0750
font_01_sfnt_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 18500 bytes
SHA-256: 55fc822f0559e1e04de35d25def49335533d4704498ee029f638140165c5015f
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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