Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf593ce5b86d954…

MALICIOUS

PDF

96.3 KB Created: 2021-06-28 12:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 65dd8fdbcd3ea84d0825eb340f92ec5e SHA-1: 07c5090985712215cee29942dedc59983600d7d7 SHA-256: ebf593ce5b86d954cabe4582148df253ee78a0d68cd2bd01a5481066602aee0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b0e160c3c2acd2151988bd1eb33fd0ef/35886216192.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7f22e514---wewama.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160862bffb6def---gowenabarebat.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/74215393919.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/lotusinivejogaz.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f277454afb---12580162809.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/8b5e56cd3291415318849d1cdb9e4f18/69842081331.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/wiwinasipamugibaji.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rujupakeruvameduna.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2c50ffe1---91352571136.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/97614368488.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cd5d5ada27c624b0156c51911e427c4e/gotite.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab911d8ac6f---51459025018.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/f3q64q3l7k2i727v1l6qgov819/8436994405.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/doremufavezitigoka.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd3f38508---gexutamog.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0b4f7c799900b3b9891dada9703d9d03/10391498092.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16099e7649fe33---7563223664.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608463fbe6d90---mirenulitazugosomiwabe.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/suraxajenusem.pdfIn PDF document text
    • https://miet.hu/kepek/45034668431.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vopavudu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d4acb681---35141954300.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbb712b614---tunotasuzolofev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=neo+functionalism+in+sociologyPDF 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_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 17460 bytes
SHA-256: bcceb58402b5ab2f4e7fd6fe29837539d17e2a7c54171194f971b543645f8d95
font_01_sfnt_off0001433d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B54 10768 bytes
SHA-256: 8c229cf7e0e6ca7298566d2a51cd8b3ff83d085ca5d6302886bc5fadad9ca21f

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