Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a243b68ab6d259…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 08:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03b536a25afc2c9045a89bf8910d3d29 SHA-1: 4d70d35b1a1eeb0e9e35aab24e662f480f13a509 SHA-256: b8a243b68ab6d2595c93f392e744f7f44477edb7ccaffb195e30e83f20203532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms. The primary goal appears to be redirecting users to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=uk+ipo+trade+mark+opposition+manual PDF link annotation
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6gg1pnoo058o64jqvmjqthddr4/80983604992.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5439a0f4794d82bedc1e931028ed6ae/fogufodadomilul.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/u681p6u10ckodv2i1d33amo9m4/kexosogix.pdfIn PDF document text
    • http://didula.ru/img/file/xuwogasukulufopisasodate.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb46350c6---nilisudakijukinuridoja.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4747a3cd44---zuzivaja.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210726_764935BA30F297B0.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/44672504737.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f484c8f0f37abc3e5a734d673bd575fb/lenaga.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7cvbknn0t6sc0afksk7nhhlp77/gokawosumegabiwejesel.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mofoga.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad519e8e1e6---88061814087.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/442a9ba914ef149dc652ed7626a277eb/99366395311.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/26359153006.pdfIn PDF document text
    • http://thaiwoodengames.com/files/upload/files/wiwukibid.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jademasasajegifidozo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/031af25d29b22848c4af7af3a5a1ea61/kavipabup.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/83129943148.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/watukidaludikenapeselob.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaae6e9adf---lugufaweza.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/61705338407.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/renijozedizudu.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/50738079463.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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10752 bytes
SHA-256: 6f96fc954821b988e38e3b8f74df04be2086e4bd33a6eadf68c06d939119e24e
font_02_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 17004 bytes
SHA-256: e68eac7158f405c2fbd317d77cb16e28a74c118d9c12bea36aa1e425b67a7416

Open this report in the interactive analyzer, or submit your own file for analysis.