Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb3fa3b79e1c0aa…

MALICIOUS

PDF

72.5 KB Created: 2021-08-06 18:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1593ddd4b40ec29d2da97581f2fa5115 SHA-1: cdb1c7304161b7a37564785b5ce9e567bcc45fc9 SHA-256: ebb3fa3b79e1c0aa552acfacd757efe9b956836a0c133d31a7b899bde8b7d4b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns align with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/12386646069.pdf In PDF document text
    • http://wasserburg.pl/userfiles/file/98120938177.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/36018495306.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/1966963330.pdfIn PDF document text
    • https://digireg.at/upload/vomanol.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521121251682853.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0ade61cd9fdf5797f3c332dd8b397589/zuduza.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/54972796775.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086908eb407c---xejufebojevizoligufavov.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827f32803da---nuvewarar.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/bv49grljl0852n903qt2rloaen/xunewobodapododi.pdfIn PDF document text
    • http://muszempilla.com/files/file/14081369779.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/87041246938.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bdg5jo3nqnjd3f8dtim0t7ilcu/miwudavarud.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/73081596829.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/231ab25d597424275761fb99f68c9576/63753849610.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wagatikaza.pdfIn PDF document text
    • http://saaretravel.ee/images/file/xirerejowiraluposururida.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/aa07463288e1c56bab4a79b2248e8851/baxebumij.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/telodowobalerevofabudaxip.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/96464805860.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/fizozinamawomoxan.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/84564711163.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/makarutoxozavozuzixigegok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=palabras+agudas+graves+esdrujulas+ejercicios+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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 11028 bytes
SHA-256: b9de8df1998c92b6f742ca5eaf1a89c451adae2ca069fbf507694ea6d67eb30d
font_01_sfnt_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 15996 bytes
SHA-256: 66b577a7960ad15eaa2a75fe42adc93c00007f858ad91fac5804c7ca2ec86acf
font_02_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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