Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa25bf31ddfd0e88…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 07:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff798a617dfd1f26449318b786bb8d71 SHA-1: 74c7db37f7aa049e307d872b804999ef936363d9 SHA-256: fa25bf31ddfd0e88180c8a155bdf011246ab643dac102f0939cd4dac9ca66a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to exploit users through deceptive content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://dentish.ru/ckfinder/userfiles/files/96734287202.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16107ada385328---99363415629.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/papilubojidumarapisogir.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/99169841431.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/72825059587.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0853263001624736594.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/nozopo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071a643e12d8---92998364794.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/62912581139.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/661f7a02c733ae0af7d007a15581e84f/pojixibakezepukela.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/42768943202.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hbmosnuib8op9373ncdk2vi41i/98393089008.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/wefefexom.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/64880073720.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/72895734760.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/togogemewazit.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/81263712102.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611522239719a---75205679294.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/46561354059.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/woboropuzakosutefa.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/5158170410.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/dopemejatuvifakurukap.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d817ec31de---dijuxekiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+printable+planner+2019+pdf+malaysiaPDF 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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 11232 bytes
SHA-256: 5b4fb0f7ab5ad644f303d293da95f53d5945ecae1f3cf60e066a44003086c888
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 19820 bytes
SHA-256: ea6497fcea94092d54e4d47f3ec3bac6254a0287105a9174ffc7f0e52ec3e473

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