Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade99bc1beb90f8a…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 16:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34598aabb48facb03f67eff4a1b24360 SHA-1: 7dc601cf6625bf0183e4256fff924a9a4ab17865 SHA-256: ade99bc1beb90f8a1231c0b07aab7f20a2fc881fa347afe31c080aedd24be230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to leverage compromised infrastructure for distribution, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4e518a6eab3cafec2c188d85bce2f7d1/58402222557.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36fc3c566e---84201562942.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b61838bb4---kajiluni.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/98088789069.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/xinop.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/38cb4d22b4766ec9be5b1b28f12c65f0/fifisep.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160795fade955e---25024764245.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e0ceb1359317cc2c79b2966214d65498/76917446272.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e448d16a---75060564829.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4otdpn9vhlooidsqdkr9q8k1oa/52374396007.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/39ca210ad87018d7f7eb96c9f7ae948c/gogawe.pdf
    • http://crackershrimp.com/file_media/file_image/file/xatovapafusajaja.pdf
    • https://debcopharma.com/userfiles/file/33969943145.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f07411950a562913c6f3a079b2ea4462/57596302548.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+way+to+take+notes+in+university
    • 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_off0000ec24.bin
e0d16b1328b8e4d904bb8925b64a86fde1e5af01432dc21dc18795758268ca30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 10568 bytes
font_01_sfnt_off0001048f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 16792 bytes
font_02_sfnt_off00011ca1.bin
92818c4f8fc0eacadafc762aefbb55bafd31008d2b98ba5f015d7d126f0eb93f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 16616 bytes

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