Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db4b03ca07911f6…

MALICIOUS

PDF

113.8 KB Created: 2021-08-19 03:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcfb28b4419982ad1eef9138a8904e16 SHA-1: 79fb1e3af80736b8d8c408627dc6d76675959cc8 SHA-256: 6db4b03ca07911f6ab989057a4db1a5566d964448715fcd2b950b4bafddd74f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the embedded URLs and heuristic firings point to a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6c1009c9---70983640799.pdf In PDF document text
    • http://udemadriatic.com/userfiles/files/32162011650.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/muvevulakijuvek.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/98246095885.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf3a58e38---55080306950.pdfIn PDF document text
    • http://netflor.pl/upload/File/1799698891.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/todisuvemafefuxixilunevux.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/edd818f2171e7332c021c480e322eda1/silizamudikoratas.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceeccc2a0d---61659940577.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fcbc6d1b---tevumiteke.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/46858360707.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/de8eaf7e0f9af5ee0385f493b50bd058/xavijisodira.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd4f93224---40189059206.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160755341449f6---25183351729.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/22748852069.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/bemuwiregabame.pdfIn PDF document text
    • http://darec.sk/files/files/9248875422.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/sixevu.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/wixobosav.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/47821658902.pdfIn PDF document text
    • https://777mto.com/contents//files/jinutakovixafo.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/gipedutugamugumovap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=can+you+download+minecraft+story+mode+on+pcPDF 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_off000157c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE0 11112 bytes
SHA-256: 629d60e8d7665a78cbc6025304388d7a6c616fa1eb1d293f41434f311e52383e
font_02_sfnt_off000189da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189DA 17928 bytes
SHA-256: 758874496a293c0ffe7d945ed79da6f19f23510fac654f06eca19408d00f995e

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