Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcd6aed30f61c65…

MALICIOUS

PDF

161.4 KB Created: 2021-09-05 01:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f950525807e046d6d83c4f552038b04 SHA-1: 396dfef581214de9d7e11bca005ed746764069a3 SHA-256: 8fcd6aed30f61c657f7b522d39822375d5a6632a37890453f63fd4c89158fa3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://huntic.ru/uplcv?utm_term=ley+org%C3%A1nica+4%2F2000+de+11+de+enero+pdf PDF link annotation
    • http://oishisushigd.com/uploads/files/87269759237.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/39932503276.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6303220a041d7659a332ee765536a269/67947273145.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16564794832.pdfIn PDF document text
    • http://zenithmetals.com/files/kizumogemenabuwefojefixe.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609488679ea35---legemutupo.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/rukupobomutexasa.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/5089908038.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/tukshd2lueimb8457va1m69d9k/lijilisu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/crk16c3tifn7b2gj8n6aiqqcd4/79972427915.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/bedibobujusivowofa.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/latibuwin.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/gasapexesewomifub.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/kexevuzikowomerijofe.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/laveralapevokanel.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/sorefivapipiwejibajafew.pdfIn PDF document text
    • http://turnyras.lt/Files/file/gufelawezibufivonujo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b52bafb96e1---tijobamupujom.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df583986dd---5998790113.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/22912160444.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/xamijasujufoxixon.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/kisojuvanunaxenavisab.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_off00021256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21256 19484 bytes
SHA-256: 9232eecf34653ae4039a979f59cb8010ec4819ec475542566eb0a657d7f1c051
font_01_sfnt_off00024390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BA7 11140 bytes
SHA-256: 92f10e1d33ae5e7a6514add6c61fa0545ca9873180c800c60b8c21eae565ef66

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