Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0286e8902e0659…

MALICIOUS

PDF

67.1 KB Created: 2021-09-28 06:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 89a5c549c0800f814f654ba82ff6013e SHA-1: 737287df673c36dcb8d41b9bd0544cd92bb96656 SHA-256: bc0286e8902e065962f53f3fe0c566b8957ffe7319c5e5bcaf589fcef236a3f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to redirect users to malicious content or phishing sites. The presence of multiple unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://goez1.com/10005001208290177/ckfinder/userfiles/files/21079291261.pdf In PDF document text
    • https://ewastexperts.com/userfiles/files/durudogapomapir.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/9749511145.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/nexedexepifojurexizimepox.pdfIn PDF document text
    • http://topp.pl/_topp/file/wemenavidedofizi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/t3a109quofr1afk9p604aq3gk7/36477968176.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a51a1e175---94717222876.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/jokovuvu.pdfIn PDF document text
    • http://huntland.hu/upload/file/17240953816.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57929111349.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lc5i0tk8godsce3mts8cn50gd2/61531392519.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/paduza.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/36988286335.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/90914685219.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/31349564009.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/38216554200.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/98209304694.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/najovozonajaromupurebetut.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/xikitawaforufex.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/69052710073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=snipping+tool+android+phonePDF 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_off0000aa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA34 14836 bytes
SHA-256: 1be779568c2c87e394272d3311231a9b941321dfcf968f4df4e937244852b98f
font_01_sfnt_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10576 bytes
SHA-256: fe56ea59c218f0e8ac3d92e5e6ba8f6d63d4da09798445849a54759e90851785