Malicious PDF — malware analysis report

Static analysis result for SHA-256 f852d1d26db84ee0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 15:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87d2efb5dd513d4e510aa46f6b637d82 SHA-1: 3a7022b5c790ad7b87e94e5a72e313f14043c02e SHA-256: f852d1d26db84ee0d350dd923c0c141804d4e82de2b95c3245680c9d53f0ebb4
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting. These characteristics suggest the PDF is used to redirect users to malicious sites, likely for phishing or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://smartmedia.ro/app/webroot/files/userfiles/files/3138167322.pdf In PDF document text
    • https://sitarasign.ir/data/file/fiduboripiruku.pdfIn PDF document text
    • https://spyboarcams.com/files/34557845328.pdfIn PDF document text
    • http://st03.it/userfiles/files/52642525973.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/pelodexidiludawewuwoxad.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613878e8aed29---limutolawikazivan.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/29033254297.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613811ebb74c8---roxuvenoximuganejufeg.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/69437226711.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/mififopod.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/73510617460.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/geripapopigogep.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tk9q1io8g9giikep3jki0cbgu5/7165082641.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/46275836245.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/64716313022.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/xasusinuxilikiporog.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310844390084.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161340a6adff92---57329272270.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/be96492d7b3e39d3bcdc2aff5d5830ba/95239325677.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/vesetefor.pdfIn PDF document text
    • https://fong-cai.com/upload/files/16776057301.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/32431050303.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/kovuseduraxarajejix.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mlk0jhbb2qra2a8a14rc46teo6/75422120714.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/vejakisefibotedapa.pdfIn PDF document text
    • http://tyextractor.com/d/files/21288845492.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/futixofugupakizeguke.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/17148429961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=models+of+information+retrieval+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_off0000bb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB11 10716 bytes
SHA-256: ad1fe913f0ffc4da558cdd59a3eeef265049c88a13165e6767f7f46575e31f3a
font_01_sfnt_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 14928 bytes
SHA-256: 028fe20408121629bc54e720f1495190f0cdc6d2e87fa69465ccfd01e535c2ce

Open this report in the interactive analyzer, or submit your own file for analysis.