Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fb0a7ed8b3396f…

MALICIOUS

PDF

79.6 KB Created: 2021-06-05 22:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4385609aea1716f3a94eef35c1080d8b SHA-1: dafa07135fa3456bb7f84101a723737d4021364e SHA-256: 29fb0a7ed8b3396fbaa353b70c5537984fc7e2f14842b591afe99f61d696d684
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to compromised WordPress sites hosting further PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' indicates a phishing or malware distribution attempt. The ML classifier's high score further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=carrom+disc+pool+mod+apk+unlimited+coins+and+gems+download PDF link annotation
    • https://sinhadventure.com/uploads/file/33909333207.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/a7ekm7vn2l62b0s0r34qtrqa5f/gerifaretanudisusex.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/satuzoruninimupipexozum.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gejatotavo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4633de48ec182f4fb6b2b5a04416f626/70309897470.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7987d77c9---14160663843.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/59af92507f2a3b0819dfcf63bfc442fe/57578786415.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/oajqpuo62ft53aa3r22o13tb1b/96823559478.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086474898c47---zusupo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b13aa34e2d8---7146789840.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/fidekasewazudukap.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/98503145250.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bed51ebf4ad24cfaf2e7dad08cd8dc44/3973323317.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/54731506909.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/22973841904.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/vazutafikurukemuson.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/99139274376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 5456 bytes
SHA-256: b5f57680dd33955f4d0a3bc5bf19612c42aeb621ef0a9b031453275d7362941b
font_01_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 11456 bytes
SHA-256: 0ccd2b3748563f7c3b3d89d66b77227c2c1140d4b536ff6b94d801f6c8350b65