Malicious PDF — malware analysis report

Static analysis result for SHA-256 7834bfd6c965c8be…

MALICIOUS

PDF

91.9 KB Created: 2021-08-09 22:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 416859bc7e38dba123dc6774a22ec2e8 SHA-1: b5f2171e7b17e0f01022e26c4813e864fa6c6cfa SHA-256: 7834bfd6c965c8bec77cc4f735362fdc9745316823c67765f811f9c026d5f582
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://officinedesign.it/userfiles/files/49795816896.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16099faa5c0377---36655046373.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/dalalinuvugiva.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/72665174444.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9ecbbc2d8b417b18170efe47f51ce237/xavowojo.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/1103409858.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b732e19a4---48443241779.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/58796771756.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ed7c4e42d56ca87664a2679a9b33cca4/merubugiji.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/gedesubowedozejetobu.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/pifazosojusumu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0bc9fcaa8f7021fb6528a978c6192b35/70142932835.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c4a23121---69558420582.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a88dd42d2---puzufitidugobabitewujen.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g3gf92s5nen82r68embb74cst4/tejifibofumejusimofa.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/buvobujomunumijeluxoxobef.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/81074086406.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/906db25faaa3aa32bbce24a07c307471/96889483724.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63138b36d---47964415261.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f0690ada---mogiwiwewozugisedofeduwep.pdfIn PDF document text
    • http://poorclarescork.ie/images/bofukuvaduzewuvokow.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8a7ec1e8---15837176727.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2dc8c4b41c16a1416bc838b4ae46a875/72958783478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=estructura+del+texto+descriptivo+para+ni%C3%B1osPDF 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_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10964 bytes
SHA-256: abc79e3d2994346f7eb6fc7b2e2351e1c27171758741027c6c8e30fa4d73414a
font_01_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 18576 bytes
SHA-256: 43f4c50066054338e380c066a23bd786339efc0336d6246826f7708e6e7bafa4
font_02_sfnt_off00014690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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