Malicious PDF — malware analysis report

Static analysis result for SHA-256 3721534438be7d79…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 07:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46fd0ab1580aae4f4f20e01cadcd1f8e SHA-1: 4013b5fff81060693d3b43d4487950ef8fd31524 SHA-256: 3721534438be7d79eced285c927f34d9592146d387743c19e2249cf8c286f550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=real+gta+5+for+android PDF link annotation
    • https://textosolutionslinguistiques.com/upload/editor/file/binofupo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6dc86b1d---vagubaso.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/65cbc68b75941e59fcaa313c1b8a44b6/pexinowezamavevidanepu.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/bugatusorure.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3d5404b4bd58b48840b1728fab29fdbb/pobisobafivuwas.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/35776675999.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/databeni.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/pesofepekineve.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/xiluza.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/71960101166.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/zimenixez.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/74346421029.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210906175529.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210921104848.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/xirimukalupivuteroke.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/44064226241.pdfIn PDF document text
    • http://haki.vn/uploads/files/panixubijakabelomuwez.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613632fee912f---11296682503.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/neresunasujiled.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/18178487807.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/pexiruramijumufubo.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/32044028724.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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 17576 bytes
SHA-256: 17d5b9da0f2b2c0354f8e5702da7a11d3b6c321becf5aaaabe109c0741bfa810
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 10540 bytes
SHA-256: b3a24ee33f82251e1c853ef479f35278a359e56aa7be386d2280ea0ef9e7e8b2
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1