Malicious PDF — malware analysis report

Static analysis result for SHA-256 e828dc092d10304b…

MALICIOUS

PDF

91.8 KB Created: 2021-07-21 19:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2212d0efb6b4cafc9eca94de002798b9 SHA-1: dcbf9ddf7da46c6ddec34809d33df00b30b7eab9 SHA-256: e828dc092d10304bb60aa8ee2157d9e40a1149087a87bfeec0f738fe2fa835d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://akapacha.com/userfiles/file/fajizobidojutide.pdf In PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fec2eb0af---vekibuwerinupadiza.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/21567812545.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c100fd8e46042c16fe7771bf8ca8a167/78802125371.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/38985839145.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f261e06dd---murafojugupefuzisapavis.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/fasapefox.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dirslen9foll6403nsrdf04o80/43706308824.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b952eceec---pilixolavo.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/zidozo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d5fce365---90176408668.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ba0d50b1---95493750755.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/8d92f9.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/78689685620.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/jakelogukupigi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/6o9tpp8cimel48vp3m05ssoo1f/memufegixituvowo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8fe1aff3---xezemavovirekarawu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cd2dcd072d86705a03407a8b8cad2653/toxosevawutogigijo.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/nodubajujolamud.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/3317489956.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba222eb1fd9---wiwujatog.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/58402785686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=iit+jee+previous+year+question+papers+with+solutions+download+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_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 11188 bytes
SHA-256: 03d3c58e5f5d1873056e0ff499029599619b07e7ffd573aef867d4ea30a4e289
font_01_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 16720 bytes
SHA-256: f6bf0ec2ed2cbde3d26357fa5f3e80bde4b903b8f1b50578314827144cf3993a
font_02_sfnt_off0001468d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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