Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fb3ca9c7dea47e…

MALICIOUS

PDF

84.5 KB Created: 2021-07-06 10:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 05afb4f6c36c144e3b8228e366398855 SHA-1: 66f40a82829613b2ecd424ef7d1052aa46117c57 SHA-256: 55fb3ca9c7dea47eddb4f845454204d29b86cdd2b87a2c525c9b73be6c2d6d7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and links to compromised CMS upload storage, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=state+of+nation+address+today PDF link annotation
    • http://ozanatalan.com/iboard/includes/userfiles/files/vojafarasiloretawo.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/risufadirobukowiwisor.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1696b3dfc---31850139297.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202165651119295.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8e02e347d1e84b9c2f55ff7fdfd065d2/taxesupoju.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/lalim.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6be08c37---54656142894.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89ef7c476---69148823849.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/95246542246.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/jilamupipetanajusolat.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa53eae9520c974256cca8a0d8b333cb/9397029739.pdfIn PDF document text
    • https://samowar.ch/upload/file/82486626631.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/zeguzaf.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/84774982778.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kulapewotut.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zorilemawajigasesotajored.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5b0560db73215d92a1844ec7f9386192/59679535324.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d789ec7fc6e---55228263202.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/97907419355.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a22995d6---jaluzabizexefidewej.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/wukosupuxobobaromevipufa.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4c902096---zenos.pdfIn 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://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_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 17796 bytes
SHA-256: 82ab8260a47ceccee301f5bbfcd17fdcfb0d32748e9aa260ab5d0d30d37ac2fa
font_01_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 10492 bytes
SHA-256: 5f9592372e536f1b7d25f867746f64be5ca9017bc97f4d15d2104734703dc63a
font_02_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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