Malicious PDF — malware analysis report

Static analysis result for SHA-256 2336ce899acbab11…

MALICIOUS

PDF

84.4 KB Created: 2021-08-19 08:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: afbf37280c9f284d9557e95ec947fac1 SHA-1: 5c63be4677f247ba19a539d9e773a9ae4fd90efa SHA-256: 2336ce899acbab11fece2f41118f3ca9908b62a4eb69e4ee152e5495867089d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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 http://trevorhannant.com/zizuzev.pdf In PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/45151370713.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/podojobiwetebe.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/68003060882.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/57204447357.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f211b58f---vajodapakaxik.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/65815183223.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2644e08d---nexugowuke.pdfIn PDF document text
    • https://aaaxxion.info/images/file/rubuwaxozisoludarile.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtb5iv7orbg4f279km7jln297l/wefijuxewiru.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607545560ce70---puxaxuxuwijorigurameb.pdfIn PDF document text
    • http://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/32623752342.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6392be2fa---54481245220.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9c61abde---vefemivijodedeniko.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/tuzibolus.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/gobopekigodarado.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/logasujuxu.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/sinigixusow.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7fd8c42ed---vejubodiluwezowisu.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/40551551971.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/xojaluruka.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/mubiwa.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/884eba546364b59b52d6cd4fd52d651d/gaduzegimarokodogalis.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/66735904711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=similarities+and+differences+between+simple+interest+and+compound+interest+brainlyPDF link annotation
    • 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_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 11296 bytes
SHA-256: f9618fbb5d6ed68e2c7eb0fc7f5100ee5d9b412cf2d24325fbb96ec06e83632e
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 16648 bytes
SHA-256: 230185bb939e32ee6b912bbe985ad7b8011e8c93ab80d92389e4468fe838e089
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1