Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9d454b2c84d96c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-29 02:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fdace88994b0d57b1aa99b1abce8a47e SHA-1: bd303db94f81e58873548a6d79c76b08b6002a47 SHA-256: da9d454b2c84d96c91742b857476e45989f3a4b15ef99be249630aab57f8d506
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://flour.co.uk/ckfinder/userfiles/files/vadaba.pdf In PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/fafowakelidodibaxa.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wonezaredofedipewimud.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/badazaliroronuratupoge.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/69020576048.pdfIn PDF document text
    • https://designclarf.it/file/42019997892.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5678dd8cac64eef3d125298be729e5da/61719855183.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0fa126b75915a6637098725358819d89/xujadabisegowajoninopis.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/1286208396.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/26787388887.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bopunetalubopusixezisivow.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/65748382948.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/m10en25thvlauila76kjkg0fa4/tataguxojolipe.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/dukomegizodeliwamosaw.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/37615358937.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/6674302772.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/mebigevufababadupane.pdfIn PDF document text
    • http://keyday.ru/files/files/32543685993.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/23254366941.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/timonedewuma.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/vubasivavidomi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd72b30ed---vugotogizunularererame.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/jibinatazasanezuriwukul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cara+buka+rar+di+androidPDF 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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 10160 bytes
SHA-256: 6b87f60db8f6568882af86f33d425bfc7d973143a5baa6aeea8c9ac8465dc8bf
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16920 bytes
SHA-256: fd6db0666e24acc6cc9c2c0ae65cc1684087c07b79dbf75fc382d93a6743c879

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