Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eacde43ffb91c3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 19:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1143f6138e20bdabe6f529486b531e70 SHA-1: 0d814eddaaa9e12a907f09d7426087c940dba352 SHA-256: c8eacde43ffb91c38d208249c81e7948869312da189ba878124cb5776a1bbde1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=rick+and+morty+streaming+season+5 PDF link annotation
    • https://tssch.in/tssch/application/admin/uploads/file/semewuranaxurekibekilu.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/72089785519.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/66204987549.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/lawilurejisizo.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/radofogiki.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/pitesokobut.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/bebepeg.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/46472035656.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/xijaki.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/70007954411.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/35251355224.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/xoxunapozirat.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/96500962834.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/pukisisalazotozejinobap.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/45728372634.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mvrh41k0bj5qh4k6hivl5ovcl4/lefibaj.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/lomugubefekawi.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-3/20210903185358555042.pdfIn PDF document text
    • https://laps.pl/userfiles/file/fufemadasivilaso.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161395edd86ed9---84591852100.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb181af79---8996871349.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/41649567455.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d22620f6b162672d9dbea73457752e46/xejawojagol.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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 19432 bytes
SHA-256: 716b8aad8deae65b71d3192235cef60f65519bb9ba3f68e2f8c4c6c1ce4b5853
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 11052 bytes
SHA-256: 09984a0e88f720543789ff2cef7cdb865c660be39f1db61681a57ade5cf00446
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1