Malicious PDF — malware analysis report

Static analysis result for SHA-256 737b235427bca043…

MALICIOUS

PDF

70.6 KB Created: 2021-10-05 08:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b8ca2ca5190ed20ef944d21055c743ec SHA-1: 46fd840ec556dd0955cfbf6a948b742f48ff8fbd SHA-256: 737b235427bca043d80f7d6c805573d5a8b727546d552bdd7fe794498e665cc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=causes+of+dry+skin+all+over+body PDF link annotation
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/bugilivovaxuxolorup.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/82522916313.pdfIn PDF document text
    • https://nistd.in/userfiles/file/lavujukexalufubotenidob.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/lubezojifirakob.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jgnfh78tkk81cmvet5939ogpvb/74887784009.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/xoxulepovobejaduvopasuwaw.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/xedotodamupejijatuper.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad83503c8f---vosefizo.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/55050709164.pdfIn PDF document text
    • http://nineslash.com/user_file/file/91467223401.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/86549561158.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615746dadf7cd---42974704019.pdfIn PDF document text
    • https://ottopianos.nl/files/60850818479.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/fugalonedurabufegoxo.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/bawupojusevebozalo.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/48533618734.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/wepenerez.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613475f50b502---85407406203.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/6170574883.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/gogoxazoranirekegilaji.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/65289053757.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede3608fb5---xorafuresumiji.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/32059006528.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_off0000b31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31A 10792 bytes
SHA-256: 25e0fc96b98ff287d9daf617af61b2eb6372c40647acb4e0759c346ca402715d
font_01_sfnt_off0000cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 16012 bytes
SHA-256: a100cdde04ef112c21e438a7e3c6f38fde7319ca65fdfac4366340e3456ec44a

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