Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9ee97b06760de6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 11:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56bb3ff1a7f07449d0dd05061a513a7c SHA-1: 764a3930ce9e486ef17d56546a5d4b7cbe3e23cb SHA-256: 5d9ee97b06760de616fcbfd2fd0d5e5bbd5e6bdf71f33afd637f2a968271b6a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Multiple heuristics point to the document functioning as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, many with UTM parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://drukarnia-warszawa.pl/pliki/file/zepoxesa.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c916ed3c---7935468061.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3c3goe9nuein618jooj82f36023j0vj8/darudobuvifafirimifuzeg.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/43770774989.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lakates.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c12c08e6---wopavexasetujajezezot.pdfIn PDF document text
    • https://kildevangen.dk/files/88347972075.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/nonedotusepuzomegakizer.pdfIn PDF document text
    • http://all-premium.com/user_file/files/95441368187.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/xotekarubojexanurap.pdfIn PDF document text
    • https://ewt.cz/res/file/88702487776.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///rotisofutefekurafas.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/sutigujurenewotogekukibo.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/darobagenubezafizaman.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/22583aa40706d02a2c124fe2470cb75e/gufebali.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b269b504747---82877741844.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/948e01f77aeb42cd81be522ad6abbcba/jadufotol.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160985a614ba36---52859261652.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/rorakegunexoxezolujatuju.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/tikoreditabutefujikugeb.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ffa8c67c---momaroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=compound+conjunctions+list+pdfPDF 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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 10648 bytes
SHA-256: 7f1f0c43d6a34a79a3cef442e402a757d92c1e0dda4e9ff771afe18cf2786bc7
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 17808 bytes
SHA-256: 3f06f10d415ee2f6ebe7f7247ac8dc8fbd34763c0d898320e7f45e62f0186cb3
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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