Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a6bbf76008bf6b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-08 05:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7cf5ec9b50b692b86f70ce59f180a8c SHA-1: 6f18e874fa05434d213760a97bedcfcce792e526 SHA-256: e1a6bbf76008bf6b0de4e64a5c03adb1ae5432d5cec1f3c46e355d42ae22031f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0530aa064---xomaraxasi.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/702195471e8ffc12f7d699141a00f9fe/86835422286.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/namixo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a6e7aa7a3---jafefizoxuv.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/31171552810.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/22788517452.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/soburozufivovo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161355fbb53904---27062660394.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/dezutepekovugiwubaf.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160777e5c51cbc---wujudesugameno.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099c31e44376---guleno.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e120fb672fc31216b137e3f20df5923d/29381214615.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/bajurunuruwibefani.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/gewaladulusax.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/xolurafejefopesotalegejil.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/wodikomabuzizejopuk.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/8494691171.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/tibevubaduvedilotam.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/balurumabonik.pdfIn PDF document text
    • http://teresachild.com/upload/files/10933178097.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/xarolasizez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=environmental+impacts+of+tourism+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_off0000b05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05A 14840 bytes
SHA-256: 6522e8634acd828cb8139cbd262934829d720a9301f15ff8221530b24969ab90
font_01_sfnt_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 10928 bytes
SHA-256: f3825113cc7609e91c804db2aacdeaf0f0f31da3e776e5d886cfaaea153f1b8f

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