Malicious PDF — malware analysis report

Static analysis result for SHA-256 53134a668b840599…

MALICIOUS

PDF

83.5 KB Created: 2021-08-18 20:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00bbaef6fe34466afa07054e695b4258 SHA-1: f8960eb0aad82223f1b17858fcc594369fb1fcfe SHA-256: 53134a668b8405996613e95efeb867fa08f02fef718a49caeb4f59ed341fc9be
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'. The presence of a link farm hosted on compromised WordPress upload storage suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/20184fd0fb6106236450d3a69c881841/tezululemakobomadegeme.pdf In PDF document text
    • https://norservis.cz/files/files/40716330501.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wegozu.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/37051963585.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/jaberipegamukosimuvin.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wilenezumatifigadakaloro.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2eb7ae1b8---41694155859.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/1p7hurquf6f9inbcedglr64a79/53978525740.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/8d6ae930bc223acc7ee02ec581e354da/fevowamamupajudaduneginaz.pdfIn PDF document text
    • http://djapm.com/userfiles/file/naposunobuxufej.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a0dd202bdf2---miniwojubexa.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f54164485---14213980245.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/35249816169.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/texutatosoxedagababigumo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f17c3177---19615022843.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/69396048440.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/50394454679.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0c7a7785---60274074018.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2pkhoeremk8u91f0rvibpb7nb7/kewukexosagekodigimobit.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/fenotonesinipav.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a301735f9f---fiziduvax.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e4762335---sesulexojuwitog.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/tadopezovejir.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/selewukesowiwomozil.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/49410685748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=verdadera+historia+de+caperucita+roja+pdfPDF 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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 10764 bytes
SHA-256: 87e102661d364de580852f95206c54e3becdd1987aff636758bc18208043ab20
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 18172 bytes
SHA-256: 82884a681408fa72db07a307a205df6664d5cba684be3270e978f533a12c28fa