Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0589b939fc3fa4…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 10:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f65ca05c7bac7ff52257632b3a41f7a SHA-1: 3bb86d15a68ee47230c9d1daaeceb6ba9e7930d7 SHA-256: fd0589b939fc3fa40049d63cda7f89492ce9f8915b35aa6512f03a6ff8836a2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate the download of further malware or phishing content. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=download+fruit+ninja+mod+apk PDF link annotation
    • http://ducnhua.com/upload/files/27059281149.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/misituxip.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/vuguve.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/87007112292.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/tidiwojojapisorewuwima.pdfIn PDF document text
    • http://chpcentre.com/files/file/26978200718.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46809970059.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/suzusuturopanifilonolu.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/judosilaroninonisu.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/tufepanuxumamalafo.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/62913993909.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d44b32c7---tonazekiwuvijonedoviperu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed586f890---miweg.pdfIn PDF document text
    • http://trubaopt.ru/content/file/wavubonopeniverogi.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zutupoxopifaxim.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/tametezalo.pdfIn PDF document text
    • https://arerp.kr/data/file///16692402580.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/fotos.pdfIn PDF document text
    • http://tatooazh.ru/files/files/rizijixufozepijoda.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/ribudijadororefujixi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e459b8fd---61201653518.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916204851.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f48d8143---6894564784.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330cad826b2---lilaliserezimegoli.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_off0000c029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 10768 bytes
SHA-256: 2dac142be38cfa5cd59dfd9e2bcb8d2fe8e37f16cf2c301dd8ea2c29f59d3eca
font_02_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 15868 bytes
SHA-256: 9d64a2a8de4023d8faa845562993f74f0c3893a322c5cdba4d47421e7474e324

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