Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5646073a0670429…

MALICIOUS

PDF

87.2 KB Created: 2021-08-30 13:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca9b08566e9ab43913a58e1bf1295f72 SHA-1: f19868076cfb7871afe1a9d9fe0bbaeaff95bf3f SHA-256: a5646073a06704290b7e5df3d6f0aacad1bb039a7dd9ca60e20cae63bada73bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious redirection scheme.

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://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c7e27f3fb59473399118c519052ce8de/mibija.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/m6j1gej4ceareun8aq443c9ggi/zefikirikotireboxetes.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f1ff84114---70048711220.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210813090301.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/dovudabusolez.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a2211a8447f4d5846176e741a28057d8/dufomonugoledufe.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/gazezofujik.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mje2bjp2gg2589vnur7n7pkd1v/56220496417.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1626331569.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/78ed2eee7f3b5623bbb968f6a819f960/bifexetan.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///wokerirowubinubozuzu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/pizumijajog.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/tewoniligigi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/95827944151.pdfIn PDF document text
    • http://geoman.cz/data/file/54134188082.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g9sipd8pl187oq3tidor5jdel9/63006480234.pdfIn PDF document text
    • https://clinicscrm.com/img/files/kumobagidadi.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/ligalofip.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/kodiwipaluw.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/kafetudanititewizilurono.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/cc58b75b6bef97bd2131a4e9eb3b80e6/96742301919.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3624b8f4e4---7916260604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=infographic+elements+freePDF 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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 10880 bytes
SHA-256: 7bfee3bd0a15d12c4778a6e01bf060d73521ad5003b92cdcc5d412e210085e39
font_02_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 17288 bytes
SHA-256: 3f495a0724f2a2a5f5d4349ef5dc89ee61069868d9b0723c85dc9b7d0c53456d