Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e8e7ce025bd563…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 00:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ce76d2f4620d5b2a4f02b103958dbb2 SHA-1: e8e6076094ab8fa7e874910bcbcb8b055b3a256b SHA-256: b4e8e7ce025bd563283e1dd941baeadcdea5e2325affcdc4e44d044447cb4022
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf8517834---41262943126.pdf In PDF document text
    • https://advik.net/userfiles/file/36688422772.pdfIn PDF document text
    • http://parilka.by/var/upload/file/pezimorakasa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1c65d8df3857cbc80131db4f5a4e60e2/74897742732.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/48508085880.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6ec8d638b5eacaf2a12cfbbf00024161/vajirewamole.pdfIn PDF document text
    • http://szcftz.com/upload/naninesonamivabamazavu.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/88330f2b45f79866bd0bd5e21d9ee139/munipe.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0f1c529a9b29fb72b978b79a6f71cd0f/5712141188.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7a702e6c---66809814800.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/libatuwewepodaxurisonas.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vukirejarin.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68e3158791---39918441928.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edefc8176ee---69644646199.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/48b203e1e06a5bee162829aeeeef8865/tozofepunameloraxijezijoj.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/felitekitadegelililev.pdfIn PDF document text
    • http://policylic.com/uploads/files/73639415716.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/33426219503.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/dubowafogedonavefofur.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7da559e40---zofofosigumigiji.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7957637585---43114893203.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2b730482c2ab27642f5777e8e83d10dc/danukikarelexefilamewijal.pdfIn PDF document text
    • http://iphysiology.ru/upload/sisinub.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088830c38f0a---70461048311.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9b9cae876e46aefcc406264638e758d7/68535404046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=partituras+para+banda+sinfonica+gratis+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 10856 bytes
SHA-256: 3ac0395265eca66b4b9f63aff99e0de19fa1ca3b356372b8f0bb5801c0f0f191
font_02_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 18484 bytes
SHA-256: fb4b161e51eda2542aaa4b5d70cac4874aea5d8260d6e860fa5f8cfb25341723