Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b2a3c84a85b23e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 00:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dca163e4da9b0c386a8ad2f478499b00 SHA-1: 1f68922325fd67761f77f89db6898d5e926a061a SHA-256: 55b2a3c84a85b23e3405604a06cc6a5393e121e15fd0c622a0a328b0ffa9e044
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Tampering

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, some hosted on compromised CMS platforms, and includes instructions to disable security software and open a password-protected archive. These elements strongly suggest an attempt to trick the user into bypassing security measures to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bulk-supplies.com/userfiles/files/31042445752.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd159a36f---78685298604.pdfIn PDF document text
    • https://kueapem.com/contents/files/tewupobovelijojaxe.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/56509745768.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/xixozoro.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/3427099360.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/66177456187.pdfIn PDF document text
    • https://ijpdua.com/contents/files/niruvegibexu.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/suxojuwoferetezaraf.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xarejetejefu.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/mugorasiboxejezuju.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/wivimoripe.pdfIn PDF document text
    • https://funke.be/data/file/61346486907.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c01b1a36e---6987803260.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/69873960039.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/retovapibobeverawotidut.pdfIn PDF document text
    • http://cudicio.it/images/file/zusojuvejulixusotaxetap.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/febojavanupuwaloluwo.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/nedelerifukufa.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202193123056048.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/nasitugowo.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/pagizuxosegegaxox.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/nerepidojiberijijevon.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407589afaf---76364153560.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109040956498907.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6892be9a---66854685060.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/segisuvomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=adobe+after+effects+2020+mac+torrentPDF 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_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 18344 bytes
SHA-256: 1c79bf02634490325dfbd09a7b7968533860301d94eddbf3fb1bffc680bb70fc
font_01_sfnt_off000115f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 10860 bytes
SHA-256: b182e553f290477df62304b38e1774f569594611f9873a159b15e9728b7b4ec1

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