Malicious PDF — malware analysis report

Static analysis result for SHA-256 b430a2acef707771…

MALICIOUS

PDF

69.2 KB Created: 2021-05-25 14:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80acf6ee1e4d48c0c617c0d7b89e1b7f SHA-1: b148c9d850572ac80566a842d4172d35c7c630c3 SHA-256: b430a2acef70777142c20f26896393a6dd0a794be8bfe683f9568c6018a16936
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress upload sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to facilitate phishing or malware delivery, likely through embedded JavaScript or by exploiting PDF vulnerabilities.

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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac08c2d88---19370200767.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/27025960bf17775a342bc459a1659e09/38658348432.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160725106207f1---867404870.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/43addc540dcdef9c8db5a172ae0bf365/60700732059.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87213523a---tutabujipodosoj.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9929f75588adda51d7ab67382cb25b1a/mexivelimebabonutirasil.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724804d0161---tatoxub.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cfc2b33161502d3259b43d4f2b9c4c93/44293239760.pdf
    • http://ackerviewguesthouse.com/userfiles/file/86339374195.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/22736f517a3ae433dc6ea70b5c7e7aa0/vexisiwowijilimila.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160abe75bf27be---7377704043.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a4a0b58a8---19350901931.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b644f6f2---7422356146.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c0a00e087---sirubav.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0ba745c3d4eb5ad665e2c1c5e252bce0/maruf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mixing+tank+design+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d351.bin
a35921ea19a9ecabab4acf6593261015a58bbd49f77c551889643289e4a524a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 5220 bytes
font_01_sfnt_off0000e548.bin
a587026450d66d5d64516d9d95ef8b73071775dad28c3ee89da700f09616fbe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 10320 bytes

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