Malicious PDF — malware analysis report

Static analysis result for SHA-256 966430e38a1bd678…

MALICIOUS

PDF

72.9 KB Created: 2021-05-22 18:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f999ec1b6c7c3f79e3ebc90badabcc4e SHA-1: d9267a382ecf9457d3c0a1531a312fb4021fae46 SHA-256: 966430e38a1bd678146e0d4917946c6ea4eccd7ac344fe790a052c2d9866f2e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the structure of the PDF indicate it is designed to redirect users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075221e8be1d---fedawe.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/da93597cd6a20ba32b1baee24bb7fbac/zuxonemovelevasisif.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607911dd9a748---fuvuxivaduged.pdf
    • http://bmsorganica.com/userfiles/file/18046743215.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/0o14c5s8avei4dv8095ppqak9j/beboxebupubasopazemigakog.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160775d0ed50ab---mokabifopizin.pdf
    • http://elitaliaweb.it/upload/file/29359769337.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609869c3c0d5c---28169479844.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f826af4f---lofisiwapizunixus.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/12477121212.pdf
    • http://yuha.be/_files/file/5326067970.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2d9ksvkuahjfu5df38n74unirv/60788342433.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7792e263f0bba5403a40b6d8f210f4b3/83256243950.pdf
    • http://arch-teh.com/pic/userfile/24003570945.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0jlcoi14hecna23kbafuma55bn/temapipifipogurerux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+program+my+chamberlain+universal+remote
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfca.bin
e7eb65dd0455af8bfbc1c9ace98c4324196707b9514928f1e5ea1441bb967cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5844 bytes
font_01_sfnt_off0000f399.bin
88c86745542f3f5d86b8adc6d2ccc373e4c24b5a3427f6daf57e682c7338d0e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10308 bytes

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