Malicious PDF — malware analysis report

Static analysis result for SHA-256 91099c7d0e0663fe…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 14:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc0bfe888ea361b39e014dfda7b85c67 SHA-1: 2c616e1f8cd997dcfb733f8ed73870c830fd9805 SHA-256: 91099c7d0e0663feb46feda840a089e69c39a9b8fe7c2ec06c4e05abf3efe68f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of a 'utm_term' parameter in one URL suggests a phishing or tracking attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=download+watch+any+show+apk PDF link annotation
    • http://tnslib.tools/userfiles/files/36312741584.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/92658470711.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6addafe22ce795450f45af8f78a949f6/xupozuraguwexulebola.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/fevexuzoxutabolira.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/60561628440.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84c783ac5---ridadozinovuvusamo.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/52319929402.pdfIn PDF document text
    • http://forti.in/userfiles/file/gefiwurexel.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/2811280422.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1a3c5f79---12131858921.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/vupenobared.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/jibupenimuduxipuzik.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/sigoj.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/piketifuninisifejuxa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e76679a9da8e2b848e54893e89c26c1b/1234046451.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ebe5d6105---difixefipenutavelejerebas.pdfIn PDF document text
    • http://3sdent.com/upload/files/35501704871.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/839c609c468bfde7908d0b29e8bd185a/6617724839.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/sanafelitoxomiwekakugegej.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/89034880323.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/potamugelutek.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/vorigu.pdfIn PDF document text
    • https://resicolor.com/upload/files/fezoxoj.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/mividuzamotunurovilik.pdfIn PDF document text
    • 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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 18988 bytes
SHA-256: f6e816e9ae9a57ba71c5d988ce4b314ca9cb5332b1f0655160e3c52c7f64a692
font_01_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 10580 bytes
SHA-256: 0e08ee18f82ae42e02323c0810be645e13c94ce826939e9a947760d7dcbe8903