Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c79336b65a42431…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 19:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d71789aa4272cddd14bcb0351d7373c3 SHA-1: 3d41c2414cec8f3768abd87352d792c7f9a602ec SHA-256: 0c79336b65a424318a5288b8ed236db53e37d8829bbee824445930221ec32584
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of urgency language further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://podiummoda.ru/userfiles/file/vejota.pdf In PDF document text
    • https://hutechsolar.com/upload/user_upload/files/19653574507.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/nunevekewevujine.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/wanebabaxinije.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/lafufifivaj.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/edu2k2e1uri6v9cq3rb95db903/wokuwepakimagalimi.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/fexoporekutosevixokokozud.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e1qrastnkvs6bbrdpns6ddojg3/43004082961.pdfIn PDF document text
    • https://aashianarealty.com/file/solerujuxefipulofip.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/tanesone.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c5440d88d---37377463663.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5fpo1jrmra9n7l89cu9dvp91g0/visikabufeto.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/69031961385.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/69945687060.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/97681410959.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e2779acb---vuwox.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/32226703025.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/71625274564.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/kowaxevopulemiwosamedi.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/wimibelomudedet.pdfIn PDF document text
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/50901950489.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/53644594161.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07151af6a---dedeporafe.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/buwoduzokelu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5579d407cc91635bcf818fdeb5f76c9c/57405457787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rehabilitacion+paralisis+facial+periferica+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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 18900 bytes
SHA-256: 9cabac28f395e52ef495a5f1c0ce21a1aa46d932d5f518e4d707e685ceaac964
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 10904 bytes
SHA-256: 4aff32d4b2f7de335c71dc41865a8dceb47811266603582c42275f8afe5bb84d