Malicious PDF — malware analysis report

Static analysis result for SHA-256 b972cb1c5a314fa7…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 05:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6386552a25f3da6c162c71ec3f0a5af3 SHA-1: e625c83078b98cabdf27c966476c36e905714ed8 SHA-256: b972cb1c5a314fa71f5b1e91cc82408510bc197089b86cea7a770e003a76625f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=cara+nak+buat+emoji+iphone+di+instagram PDF link annotation
    • https://moolans.com/uploads/files/kenisejixawivoxudorixi.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/62038080725.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/femiribovibewesudaj.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/63e6b7987776dd2611b9a800333d3b6d/94797254241.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/jefubabefa.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/tagilakepumidifisodabusar.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f2343a9ccd43d2a292587233692a3d5/misefuvetekefowibujoz.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/65824528269.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/96669164477.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/dixipupoxowefexef.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/32906932674.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/66574449047.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/99917417212.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/zowavawojulerunexunoto.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/detadusekitewuluzupagovuw.pdfIn PDF document text
    • http://centre.annuaire-regional.com/ckfinder/userfiles/files/13871198996.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/butawuzorado.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/fotopunekudep.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/nitixoteramatelodis.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5c48a02a72f5dd506171072b67bb5c46/megobenamevonusegez.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/38011651069.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fce22e9e8e50f1c1f57e5cca47d06d88/62576127716.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_off0000af5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5E 11288 bytes
SHA-256: a2c38a165ef02de079814e49f2b50b260f9f6eea7e01095fd4328fac50782130
font_01_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 17012 bytes
SHA-256: f195d32e0e2d59e1ad6fc9118108f5f984e45948cff97c419c5fcab2ab3647db
font_02_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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