Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b4e3e943b5994c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 23:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a458cbec72d50e538f441101318746e SHA-1: 3d329ab4538581150d436f597a05c84f22645518 SHA-256: e3b4e3e943b5994c4d646ab9382f86058e3e41aef97cd7f18e0b29da4136bce3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=android+game+hack+apk PDF link annotation
    • http://ndt-tl.ru/upload/file/70262408914.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/rupotamelejiriripodemevo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/aplq5jufstskkikjr8a1ulm6me/3791144716.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ed7bep7hdn7ltmoggo9hmlh2lu/xubisujuruliba.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/55387016790.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/27994217978.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/dikuvulurosami.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/vexexofijotajob.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d49986241ea1cc77bd7829dd742347f2/12181819562.pdfIn PDF document text
    • http://hkalc.com/userfiles/71120779519.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5cde60653aec693a4f29d75b6cbb118c/42099328007.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb46800a7f---84727611554.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/wafegawupugigatadutiwixi.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/vepelabagavimo.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/mukubo.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/panixup.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128837861b29---11842171029.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/5158128120.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/dowoku.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/12a025e3b050058e5a183b994e24cab6/81495797772.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/26497170046.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/ninitezofoxidenemuxoveku.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/78357854702.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612533e30bfbc---86962059256.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/dupukusowok.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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 17180 bytes
SHA-256: bd257a6ef4ae594e44a210367faa00f3f16ad616ddcc825b2a1a4741261534ec
font_02_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 10724 bytes
SHA-256: d820b3ba92711dd46774373f9e66c2d0bf56c3c14f0fada76b7e20e9a0d2abe2

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