Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35cc58d239ae318…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 01:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce7156f2006e910b5acce5c8e200a469 SHA-1: 3405fbc4eaa1b6700ccb20af62558dae46da6ecb SHA-256: a35cc58d239ae318d1da8fbd9d8fd367cbaf1b1ae13686c2e6c9870fa6d6a9e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=super+mario+64+luigi+hack+download PDF link annotation
    • http://suachuaspa.com/upload/images-content/files/59986194300.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/kukenategovi.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/ruluk.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614263db61bde---67264971840.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/vexupeliru.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/supazopivukoxisesojojuwe.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/dopubefosamijoku.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a050fc9ae51a2da7d9e0521b8f9aa81b/38924201800.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/sulejapusuvunodajipaseket.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/63118165066.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/maxini.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/47161541767.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/92765918094.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/ziwewexuv.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/36245614579.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219221456236971.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/44242655156.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/zajowerotudidunigerijasux.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xixali.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/36309519639.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302a8675492---57099192335.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/sowaremenejozofikudi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/88599594119.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/69ba5147f78ebf9640af96282efc4cc2/piwamadewiwemivuxosuse.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_off0000b49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 11292 bytes
SHA-256: eb324f502f510d7930b58d421fdcb952d77a052169c529ec86963283d4ee1d20
font_01_sfnt_off0000ceca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 16960 bytes
SHA-256: 4d7d48b281f5450ef937924e41f076554a04f5bb77619acec1c9b987330273c5
font_02_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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