Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0cbebd2edfebda…

MALICIOUS

PDF

82.8 KB Created: 2021-08-17 03:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca6d81ffade17a4785d2e6296eaa2fff SHA-1: 56b34434c28f4df831a3712b84e764480d093d7a SHA-256: 2a0cbebd2edfebda837817a933c3128cfa93068df84fb24b328cdfef95b0e1eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=switch+by+ingrid+law+reading+level PDF link annotation
    • http://bursaceyizgelinlik.com/images_upload/files/dubolidowufola.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/xipabolomaxevuritaxulajaj.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/74c5e62bf330d15a1a1f85a8e7c5b28c/11467671943.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a421313858d2265fb9de45047de862af/jesazanadasosixo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7g516v7roe7vh3thjfp171i7og/jezelixozigebefitije.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/duwawokogi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078def1a3b42---36263913789.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/14161696818.pdfIn PDF document text
    • https://avela.md/userfiles/file/pegeminebewubezitujafosup.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33a8dbfdb---gebujumudef.pdfIn PDF document text
    • http://renknh.com/ckupload/files/lijimefexigewelifi.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/fomapixomogubimana.pdfIn PDF document text
    • http://altus.pl/userfiles/file/waderilanaj.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/19667315196.pdfIn PDF document text
    • http://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/modanabujawunusuvavuteto.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f9fdd78626c32feb19d1b97e79e79f60/84494728863.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/37740592504.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/28328218009.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/kuseleledovemod.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d96aac3e7bfa58a119243053c5e8adb/mamudu.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/filunatinefe.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/mirufiturelugidubusef.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_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 10844 bytes
SHA-256: 2223c35542708c5d59ff101c5d1c9eccfa2a381444b93e80de580179b61e3a0a
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 17040 bytes
SHA-256: 558aca146377ef8f0529e5f48a03bb8d786deaab777c32c0a71419cb69d38bd7
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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