Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14f1bf8ccec0c1d…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 06:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c9e79a6be1c793a203e36ffa894c4cb5 SHA-1: cd970b96470b37479ced3fcffb551f9786cdbfe3 SHA-256: f14f1bf8ccec0c1d9f87cbf31fbaefe01bd6ad51df4c1c9c04450daed89cd2f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the document is a link farm, with many distinct hosts and URLs, some hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://zrdb-drogbud.pl/Upload/file/sukonideluno.pdf In PDF document text
    • https://rzfmuhasebe.com/userfiles/file/87480862785.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106201000354118.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52652b5a---bobisudolutape.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/87640914924.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30bde56ef---30248794179.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c42b22d0f7e111029d50133229132b60/96507713067.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/18864128574.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/rn2n4r64ii0go6dklv5nob7en4/40139524342.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe0d4af192---vamomujebezamesulize.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/gotanadotisanulasotesemad.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dda823d6fc6c4e8b10fa65ddc9210ddf/pulunidilusewuwezorutaz.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/75895882127.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/futuwov.pdfIn PDF document text
    • http://93564497.com/userfiles/9721136872.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075943e7ddf5---fipitemuradite.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ipqlucrrlaitnhtda4ijsjb30o/54344112673.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/nqp46siuc079b0evq23126a1hc/sitobuf.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/20599162335.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/97713561100.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/64105582672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=yaw+obeng+superintendentPDF 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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 17372 bytes
SHA-256: 6482553127e415d2f9a6abfc5fb13d47f993dfba8d001c666ca9e61b702ac9da
font_01_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 10828 bytes
SHA-256: 847c7f705a775783fa11290422e67169fda736d304bd30c5596568f5953ca2c0
font_02_sfnt_off000130bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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