Malicious PDF — malware analysis report

Static analysis result for SHA-256 b593b96e3436a205…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 18:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 825920ea631fb14474cf8a18f3b7404c SHA-1: 60f1ab1de46a9240ecfc3ff9e01a225b90c69ae8 SHA-256: b593b96e3436a205fe62ee28558b6a68bac4b5720a2daf48d797dc355052bc83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links, along with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=melting+point+of+hf PDF link annotation
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418bee102d1---majavuf.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402120c76ab---ditizekefetikad.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1be3d669---70166673998.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613298aa6775f---gewanozixatowiginixifi.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/pomodasi.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/86047178581.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mojiwapamupevufakakuloxep.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133867735189---zojubedivu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/649539be5ad7b7f890ccaf95c5a1db38/67052004775.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/87821292781.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/2299572260.pdfIn PDF document text
    • http://www.edgartownschool.net/uploads/files/36324118720.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/57419439984.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/sekoworibonominag.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/83231489539.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/divirasewumifisidiruf.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/nivawadepijumuselesegekig.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3f2c757d---96869955180.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/zonole.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/3824417256.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba268c9db---konofarog.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oq9kju5isongdc7lurt0qc4a2q/kesotetexovo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0f520f0e---kujitutaso.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/nufororuzamosoxuvilu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/01140047c3d2cb19913e66906976d441/kosebobotozewajijinizen.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_off0000b8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E4 10200 bytes
SHA-256: 3373f8986fc2f1397c410b9083de56c472df3c92600809bfaf37ed507ff51a0a
font_01_sfnt_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 17612 bytes
SHA-256: c75bd5cb42ae775e2ee61250e6790e04966ba88bd0aeb68c28053ac997c6ad07

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