Malicious PDF — malware analysis report

Static analysis result for SHA-256 959aca24db45c404…

MALICIOUS

PDF

81.4 KB Created: 2021-07-04 12:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 54f644fb585695c6fdd3215be71a5fad SHA-1: 97c1c2377d7b355f685c2851839c2b39ceff6b8f SHA-256: 959aca24db45c404d5d8604af9497a201ed674ec0f45371fa2b5d3c5a12fa56d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the heuristic 'SE_DOWNLOAD_BUTTON' further support the attack pattern of tricking users into clicking links that likely lead to malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=iq+questions+with+answers+in+tamil+pdf PDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a33dcc150---gatilovon.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/63475154702.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c978a17f255---13442186399.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6809cd92344b5cf64b5623c84e12b04d/60158279984.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca80af2a1d---wogizogepixugijenakilidi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086401a686f0---18204503504.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2c5be039---3211694213.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f17bc384---toribanugebejokukama.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/44516127593.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/sh5qjf7aum8r121p97tupqtrc6/motonusasikum.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/milixogibegobubu.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/boxotidepev.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1736c1176015dde140764d90c39f8d5c/najumofutajedab.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf287bf34---jomewobamegisozeg.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nalawegajovukokituli.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/49266955127.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uj9ivm676j59l5hsl0udhq9t42/zawuwipuropo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6bjosii7epdf3if823q79nrvs9/kewutiwiruwakifub.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/56156030190.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/94750577924.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/duxijixukapusesejis.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6ef5e632---damarikawunuvige.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ea2tovd4v1mvjc298afslraks7/bunigavox.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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 17904 bytes
SHA-256: ed3166740375accd8b1daaed8f5877a55b2f8dc47db8b9e2bfc1cb795b30c476
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 11048 bytes
SHA-256: 496692c4a919d646ab01fa3e043a50947fd8708e02ae2996f9445a72a4e70197
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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