Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc6cef1635133ef…

MALICIOUS

PDF

116.6 KB Created: 2021-07-30 15:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5074a8d7a0308d3b84f56f2a174e5b75 SHA-1: a37a4ebb801da95e6da975f41fdf62d186ea7157 SHA-256: 6fc6cef1635133efea16e4947ee4ca69ec971e7a0db5d499ee96b1b407fc80d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=why+the+rich+are+getting+richer+and+the+poor+poorer+ielts+essay PDF link annotation
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae7f11699---pivododamonobaburorelol.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160910382ea411---29839137389.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984c151b239---71614849510.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/fubakopukejidikukele.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7dd07deca5a869d578a462e42da1268d/79160386792.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3f7175e5---fasiwepa.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/67103750641.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae353a4040e---58938351435.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dab41bdaeb---25049733211.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6abba44a0e5b297423a7b8bc418792fd/bewokivafilekelise.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a724b2dbe---sizomoxerarakegopoketobot.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/71102405712.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fqi1vlkeqd3g9i69lqhin2akp5/dosalozopugokarogifepe.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/pomebisedavadisu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075c662850c2---92026548281.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/074a81ab85d96fa827a9f33fb9441b85/5013850838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43af42f6c4---10931052947.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abe092363---42874801130.pdfIn PDF document text
    • https://telenovella-bg.com/files/40800227739.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/dajaxexo.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xiludubosobupi.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_off000166ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166AE 10900 bytes
SHA-256: f7bbaff467416a464429924f99236bbe3a425b5bcf8e813a5dbf15488e7cdb0f
font_01_sfnt_off00017fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000197c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C0 16964 bytes
SHA-256: 55fd45525ed0d68aaf59e4e73a9185308349bfc35e1f25f6a1cf3bab8057f700

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