Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2633b9850f24b3d…

MALICIOUS

PDF

91.9 KB Created: 2021-07-31 00:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c56c556cc20cc35c2be643f6920b0ddf SHA-1: 03fc75ff048752c82efb9afba96071720a92a8f3 SHA-256: a2633b9850f24b3d0d5d90584f7a392bbe93cde1a86edaf39a545b6acd7a80fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs. Many of these URIs point to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f226541a---7009218744.pdf In PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a522a852fca---mimugigafose.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/xurudutepewotanazavazuva.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57604c8911---kuvopepifiwipi.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/12812513903.pdfIn PDF document text
    • https://langumeistras.lt/i/File/48120010966.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/rezufamolelapu.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/bekikifew.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/11245404229.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/naxelowel.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0nrc4nh163o8jubukt9n3rhdg1/vodimanurujoteva.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d011c56c6---narebajakuzaresix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046cc317c23---sadigiraxov.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/paxawaxozusenakotub.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87af777711---39560388317.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e190a432a136995c345e37363c1340a/32525307160.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/jesosepibokatosojuli.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0fa54709b7c5d43856283985b4ea6ccf/volefujenito.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/govufadaxukusebowapef.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b4f07a0d410aefcdffdd51153c636662/xosaxelugufadijonisokavol.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/46egrc8mu38go4u7rqooe7vven/juwitu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160715468432f3---8476564376.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/7gikfloo33e8uvr5d59ihbjgc4/jezexamafulafegoweluwaj.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bc8e9tr6b2vrpor9acd12t2s49/fanipew.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/58486882166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cats+the+musical+movie+taylor+swiftPDF 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_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 17548 bytes
SHA-256: 8944bd385c1cc376cddfa3e4ab8c8ba68ba2a16aafe36b984b6ff067c34b027a
font_02_sfnt_off000145de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DE 10892 bytes
SHA-256: 0d87da2d22f4cb173b14e10f9b3983e9b8d992e51905aecbe68d640ef0b1147a