Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f7a649e350e240…

MALICIOUS

PDF

105.7 KB Created: 2021-07-01 18:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0df86e4a3b6092412936def10042ba9 SHA-1: 9316330e42341e776509363f455c3da87a937cbd SHA-256: a3f7a649e350e2400243210e868f1f6b5d5c048220015498060dd0b7a876875f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple compromised domains is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9308

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3f98d416e---dajubovafema.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3820737d---73535584398.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/0e6c90d85851da7b48b49df8a9095b36/93293159486.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8f2c1b1c03194f26e2773c9e69b0d643/rofogaginunodolupa.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kegizakurevu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9509c52cc---dagofuw.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tudesiregelufugej.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/59fa75cb078bc6bfe941f605173ac8c3/luzomewawasorar.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/jazewosaf.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/94828d62a223dc8a3bb466f5dc3002c4/2972518375.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054553cd3f---12870599216.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/dodigumuduzol.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fc3f411de---69528441513.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/lvk7iabj0a9i2he7q9djco2b1d/bogurutezusudukal.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73095ab5a---tikibe.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b331cd8d570---97301841479.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720c02e83ac---3461374350.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/63216684925.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3a5d9f23669bb89940deee8045dd3e93/vefosowidufekujujoderu.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5655dcb3e---vokuzadolujunu.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/5185891426.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608930ac205b4---91162392719.pdfIn PDF document text
    • https://stvorki.ru/files/file/fizivepur.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae909b8e22b---49092844007.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e9009e443948a76875a7937f4148b3ba/95421299451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=good+morning+in+different+languagesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 18068 bytes
SHA-256: d7cfd61c6aae684350e50d431112e0c1c9101e34a041d2be2dfc94e37ec6f201
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 29872 bytes
SHA-256: 9fc1e6ac7cf39de9547ecf9cc44309dead4ef087b469168a3ca9963639182112
font_02_sfnt_off0001588d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588D 3744 bytes
SHA-256: 1c5eaa2763c0d7b689d22cbf9958976a1c4bee3c756ec3183912f296817258ad
font_03_sfnt_off00016753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16753 10836 bytes
SHA-256: 12aca0d13d38f41aac15fc9ce13c94b062ca9a3d69d3c2d39ce4646d358e6de8
font_04_sfnt_off0001801e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1801E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1