Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a280819b30e946…

MALICIOUS

PDF

80.6 KB Created: 2021-07-03 12:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50ba96e0407a8b202fa5ab3a372b45e8 SHA-1: 55a72f10b13eced5b295c560e476e67aebf04399 SHA-256: c3a280819b30e946c190250428f5aba55087c5017d429e59dff70abb073cbebe
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it's designed to lead users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=two+types+of+intellectual+property
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f556e09596---72314132968.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41a54accc---35782984493.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc46d55f6aa---lefabatamuwat.pdf
    • http://ekolojikweb.net/upld/userfiles/file/1822332611.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5fee25a70---wuxunexuvo.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ad6efa76---lugujetisavisuwagelene.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608486a2de55a---67486962406.pdf
    • https://xenang-mitsubishi.com/fckupload/file/4959706343.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082920b3427a---8279395908.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/47fcbf28a70973b325e77a5f0b0a628d/dizatagesekaduvo.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/boxuloxafowonopowolugo.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f104cc555efe1728f0a504b0dff53e3a/76475426191.pdf
    • http://mousike.it/img_ins/files/temuvise.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072655d12f98---10442322318.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745138034c2---3598598147.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f42902baa5b989d263cb78de153ebb4/sesaxedepopuvudeg.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 16792 bytes
font_01_sfnt_off0000f1c7.bin
111d535af29f81471552d4ed78ae18df52f39b72ffb1001e7e87016ebbc3ac35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10736 bytes
font_02_sfnt_off00010ab7.bin
d4f43f2f1aa96f4f82573f5d3671935c36818d03b2b4a0d61aabe75eade9de98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 16584 bytes

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