Malicious PDF — malware analysis report

Static analysis result for SHA-256 c212940cf0f53df0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 13:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcab28a843d4f7439fe7b5d6f4e1974e SHA-1: 5d657992b4b4160520e3fd26b6554e622b2bc605 SHA-256: c212940cf0f53df076a3e216883d2c930add13fcf1b795b043f19bb7a340d2a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=hasta+que+salga+el+sol+megan+maxwell+pdf PDF link annotation
    • https://xo-sound.ru/userfiles/file/19176595974.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kalujalowudusal.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/nosuzijikulokozamup.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b35583f40---66613098205.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9261btptn42v2jhj038mjts906/pasalaziverimeze.pdfIn PDF document text
    • http://medi-sen.com/files/files/fopofamadupir.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/tonadesitekanu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/20954419202.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/e8dffe.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/tudazop.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff12cabb11---552033115.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a9cf26fa4f4b793d7c489ee41b520fcd/kunufot.pdfIn PDF document text
    • https://12tiga.com/contents/files/lobivawotobi.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/finesudomi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae4a5dd451---21665459304.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/7733200146.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613070b70fd41---24287285054.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3ccb0160aa1ebc8640f3fb790d598a0e/11829665688.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/webadizitosanaf.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/32408154330.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/kipepadoxirimir.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/dijifopapeme.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5457886d5213886c73808e3db158f4d9/32887162379.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/23787756127.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_off0000b645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB645 17420 bytes
SHA-256: 3626a8c4b2afe84c6bf6a68269ba1b5c294f3923e23ff99d754b8570cd003c8d
font_01_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 11072 bytes
SHA-256: cab5eb94ce70eaf16cf657f8d4b349e1bd54f8cf60ed5e21c2810bd82fc66e7c

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