Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da423373900974b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-25 16:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba8447a556c83012050fecbe4674d07b SHA-1: 499d2fdf2649a6fb131975296f9006ff80b142d2 SHA-256: 2da423373900974b8082274358351542dccfb4384d3461333f0d48e8d075f99f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/926f5ec12f01faab42dd5f71c139e054/vomijisepubuwateziji.pdf
    • http://tpdw.pl/userfiles/file/dasadadub.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607882730baa0---4870998018.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871cf7f414d---42398780619.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4f9efd5a92574a6ed1c81a672f3ce2c9/40778389289.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608594543f68a---58638375401.pdf
    • https://arvikabc.com/images/uploadedimages/file/82173893272.pdf
    • http://alnoorcity.com/userfiles/file/82210045739.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a258c1d496b874bb8d5bde0e6e9ddb73/8181443039.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80f3060a5.pdf
    • http://dainichiji.com/upload_ckr/files/latuwujafo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607726672e43f---wenalokevu.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/8b7690b7871e6105af0647adcd81e567/33766117413.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ase2121kob8e2mo1a42flsfofs/boxufamuxu.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be1e127df---navodigoriwakuxiduv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+script+the+man+who+can+t+be+moved
    • 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_off0000c3db.bin
6fbc64400b3cbee84868d52c12fe0669dd16fdf7bbbeb934c8a54fd12902d19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 16572 bytes
font_01_sfnt_off0000ef1a.bin
462bb754ef9be8e31a8a1d2f3006ff29008041136dd519324f57ef9b85d70afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 10988 bytes
font_02_sfnt_off0001084e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 16792 bytes

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