Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da25f8b9d372a55…

MALICIOUS

PDF

76.4 KB Created: 2021-09-23 07:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 706eb84548206821d3a0fc13192119d7 SHA-1: 5cbb830d55c8164b6393de9fda9d191bcd529f09 SHA-256: 1da25f8b9d372a55b922c06ff3ddfc82e9fa9b8ac28b29d33f56621742824fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, potentially disposable hosts, suggesting an attempt to manipulate search engine results or host phishing content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic suggest a sophisticated phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=google+camera+apk+redmi+note+9s PDF link annotation
    • http://hoachathoanggia.com/userfiles/file/kovepoxeraz.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b52e2b12e---29054097306.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/5402780342.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4dpalr2dob881hqlhnaeq3ucik/12046619945.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/niserinogubimepu.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/35643250617.pdfIn PDF document text
    • http://sun-tes.ru/files/file/begixud.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/56121667373.pdfIn PDF document text
    • http://erimti.com/userfiles/file/88615390710.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/53326809549.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/28328535784.pdfIn PDF document text
    • https://drterrace.com/london-100.com/userfiles/file/dunodukizapowoduzapitamu.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/36706704015.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/hogr1kvokv2g24jvs8341qqc95/mavujimiteb.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/76627268896.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/lijebenusibakamobusezisu.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/mujigavibupixarivu.pdfIn PDF document text
    • https://activepymes.com/pub/file/98631903375.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/49136221609.pdfIn PDF document text
    • https://kimcert.com/E/file/kapafefupeborezevulele.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e871d85d6a---65031883541.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/19115505594.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/weguw.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/navenusetid.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_off0000c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 11156 bytes
SHA-256: c57417198334a46d8bae817c1456a29c24bd1b63a0e9b297fc8298e044b1cd79
font_01_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 18096 bytes
SHA-256: d6d4f7c4968cfc0942f4244d59f719c83bd6069d9bddb0a539422056eeda858b
font_02_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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