Malicious PDF — malware analysis report

Static analysis result for SHA-256 43104fcef03cc972…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 14:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83f3a7467ab2c7714043fd5767c67d42 SHA-1: bd2ccbbc9eb640cfd87d3a8e288ee69d58e87f1d SHA-256: 43104fcef03cc9721df7bc6abe804947d1dece5a25f00d876f02faefd95890b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The PDF also includes numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further payloads or conduct phishing. The presence of embedded JavaScript indicates an intent to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://larben.cz/media/images/upload/file/bejez.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141b79c865a2---83428032585.pdfIn PDF document text
    • http://kechengchem.com/upload/files/wezosapuvadakepupevar.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/58754282812.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/fozuji.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/petiwejawatenifed.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/28005243526.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/84260704b04a2d01a853e5905e30e0b8/xilizarukugofalugidizo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b10ae8bf5ae96ec517d961ef23953439/7918501406.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109060107158612.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/74001423373.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613ac52ff1f2b.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/javevulagokaxavuteto.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/defimu.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/45882372267.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/35053322558.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161406b5a9d696---gijudivozulonixutexun.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/88fee4db458e37ddff27e1533308117d/demupetilenepixev.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/24917689430.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/foriponu.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/76612598807.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/pagajavo.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bugemasolojoleji.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/leviwifelela.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/gawivol.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/namugixodetisenu.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/67221918837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=black+light+app+for+androidPDF 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_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 16968 bytes
SHA-256: 0a41a3d6772bb9027e952e9d0a5a4fb82545258303acac544e1758e4db1c39e4
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 10744 bytes
SHA-256: dff309a6296edbf798cdb5a107b23b2d3ec68995e9c53760739b77d345c5c376

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