Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a39b9f4967fff9e…

MALICIOUS

PDF

120.3 KB Created: 2021-07-21 09:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 510aff5c1f70e2d83f48656cf80b5826 SHA-1: ee734b603a61e5c9531def4a621151674e08e484 SHA-256: 3a39b9f4967fff9e59edbcf1e6d74824ab7ccff23af95c3fcb2932e483a63dee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083bedecd9cf---84815421015.pdf In PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7bbeed388a04b319106dc7940f9a3f26/fizinixojuret.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/62878144526.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdc766c86---tisuroworetamozowebuzelol.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/23122172177.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/fopovamu.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ca571404734c94027b2a5ce19560b857/dopezoda.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3029dhqkhnfnjdo4kehrj5fke7/30693176856.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072478be6130---famaxekidujapulotalujid.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/477d1c23c81dcd4d5a95bdcb92cde389/9599941198.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfc986a974---72633643994.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/wotonefozerawitob.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/nakajobufaderamisuro.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/mukuxe.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/kozuwuwatiwisobamidi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1d3bf7a2cff4fb791067aed39baf22f9/pejebivikawibafo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hrksd29o3taunhqtbcr90aj5gr/47690929865.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///41786475323.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fa9kqhufj82ene3m2eu7aufukv/56638658681.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/ligexijoxed.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46b7544bf5---1984694660.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/41901064171.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/29b5234d49d49425ec514d2a2d26a424/rixug.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/44890621468.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160723477ab942---80594843946.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18f2db425---kafusimeropasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=aggressive+brain+cancer+typesPDF 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_off0001728a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A9C 18976 bytes
SHA-256: ea9b1c6c5981b15394e25740ba93c2c5ec9db39dad7df284f08e7889e3de4613
font_02_sfnt_off0001bb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB78 10684 bytes
SHA-256: 365e6cb105c944e7f3bcd0734abae0b509bbafbf60affc6693da1b10c8bf4d08

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