Malicious PDF — malware analysis report

Static analysis result for SHA-256 217e1fcd17912830…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 10:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8445f176f2662ad3ea0c18ff95c82ad7 SHA-1: 25d0fed9b55a06e1dc1990f0062ec87bc80187f3 SHA-256: 217e1fcd17912830769cb52559636b6e2dcf12da325a0e9afcb5a2868d1925e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.donboscovizag.org/images/files/lefelotorabujejon.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/bfeeb459dd7c8e52e4c935d6c785ab41/bixolorapenogufesil.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/62521877952.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/gufebel.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/juzut.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210921_FB95F947B2E5C8E5.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/62763661848.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/73998446948.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/dovigexuk.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/fuxatibilipazewedo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20084c0b8---30104969920.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/73865570735.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/88606367562.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/86139245119.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee7015ea6b---simolobanow.pdfIn PDF document text
    • https://atl-50.com/files/file/48107673255.pdfIn PDF document text
    • http://tencanpowder.com/d/files/giwus.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/27139393174.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/gafojurisaveg.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/bizajukiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=logging+out+of+gmail+on+androidPDF 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_off0000af8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8C 10452 bytes
SHA-256: c3b2cd6de48fc88bacc0b0518ac6431d50dbdbdd7d84a6748bf1083b3ba81e10
font_01_sfnt_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 18160 bytes
SHA-256: 869b7ecc85117130573b0030b5a9ab038142fe6423739bd6a50b4835f37e2b1a
font_02_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1