Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3bf066b5a78cb8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-08 02:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d65404d5ca60f71bc26aa7253de953b SHA-1: 43d94a8693c20817f3322e89eec593cf0ef66abe SHA-256: aa3bf066b5a78cb89193fa5ffb1309bfd3ca2a0c302374fef5004a9e2c8ecff4
124 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan delivery attempt. While no scripts were directly extracted, the heuristic firings indicate a link farm designed to redirect users to potentially malicious downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4920

Heuristics 5

  • 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
  • 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.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19279c024---vejewazatur.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ce161856---96853801150.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/gawujitodekonegodiw.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/47807730085.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210624001739173853u1d60.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/93640254810.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6333s2g3f10nmfk1sgtp1in4nv/pumape.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf510c2ca97---20588175585.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/betilujemurak.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/74923870978.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb059e597b---88736116029.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8c4bf1447c9ad6539996d3217290e5ee/34161520652.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/kelebudilitowukebunuliw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/72cd6ff284fc158089dd5d76ab59fa47/wofumojokajar.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602fa28d87---96823769398.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a62b080e6---tugisakagirutagivonito.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/90612257899.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/ledikudoridijir.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/91510166711.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/978eef68013cb0478f89c89b9a03eb6f/didafim.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae433f2dff---dilotixufezefirixexatu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/wumevavimipopok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cell+cycle+and+cell+division+class+11+pdf+ncertPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607924512060d---24381604670.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 10876 bytes
SHA-256: 1f9a01e965e8d5ac7db105dda7451faafa8cff335a2984c768551e047a7972fe
font_01_sfnt_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 15800 bytes
SHA-256: 9e735820aaa112a471dff5880dfdab35d8fba375edf1f39263cbc3e25c3fa1f6
font_02_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1