Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29eff538b710f3b…

MALICIOUS

PDF

161.6 KB Created: 2021-06-29 16:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af3ce8a8a1d508ee02f19112003cb028 SHA-1: 2d904d126267567d888a6fd643403fbf96aa115f SHA-256: a29eff538b710f3bd91562ffdec1cc3d18c97a91efcc3cd936631baf1f2d38e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external URIs strongly suggest it is used as a lure, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160864d937e8cc---ketosud.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c190e5ef677732ff4156037eb63aed2/88187660340.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/fovevamefevus.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6265d3d4f6---mofevaremevasoza.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fa5e33820a310097fc2b262b60f76d97/natiputekedelarokal.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cd70fa41ec4d16dce21c07527b92d7cb/ruwokoxugilazul.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35160dce0---vifabolorozalorofuburul.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/379ae7de5ad73b2e35583b958e89c6b9/muripijitukidud.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/1670048090.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/84649347448.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e02a56fb---milowawidoxani.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/44858688226.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3gcodicp3osb61s9refbfkpnj6/43496555198.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/movezonagasavokuvez.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4be574f1cec386698d5fc4a4652d67ea/52826715596.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c0fd55c5c---62673231286.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/95233752225.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/77011439386.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///julorazif.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/eb95b8e773df92cabcec5724aeaaaea5/46916394147.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/toramozenomezolaliratun.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd18c808c---fomilozev.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5dffadde044da160ce5d13eaa0157bd9/82617361821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=thousand+sons+codex+8th+edition+pdf+downloadPDF 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_off00021728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F3A 17992 bytes
SHA-256: 3d3ab7e3b785cafae704c3a503d37e122dd19ff04476ca379ad4dd974d22c38d
font_02_sfnt_off00025e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E1E 11076 bytes
SHA-256: 2820bb4ecc5a624317063a82c1cf743d7209858cf4177c2e099f2bbbfbce3969

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