Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3bc0dd35906e2a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 08:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9481ea049620f8a56afe0ac5f7a42811 SHA-1: f30670eb8cb93945b8c45f88e0dd98335b3c959c SHA-256: 5d3bc0dd35906e2a9949768826f0661bc34ff86701e21d8a10dde9747c1b1740
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://andrenickels.de/ckfinder/userfiles/files/milukaponosikorudebaguri.pdf In PDF document text
    • http://w-f-l.de/user_img/file/darekesijutakisoxuxaneli.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ejrru5d6musqelr2d5urddk1p5/zufuwabu.pdfIn PDF document text
    • http://gdgom.com/upload/file/210906012059116972gco5lsdt3flx.pdfIn PDF document text
    • http://canadanur.com/resimler/files/puxezuralowe.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e92f25826---tirejiwuzofagonese.pdfIn PDF document text
    • http://ruresept.ru/files/file/94298917993.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/76791656968.pdfIn PDF document text
    • http://seamacros.com/upload/file/31194816503.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/8381453735.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/serapav.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/46583054978.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/13465586357.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/mepojikeked.pdfIn PDF document text
    • http://apart1day.ru/file/76955596854.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/66163995044.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/laxefupuzeb.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/94369359035.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/rugelogaxix.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/gogizasepajadarevulenegil.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/fosik.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q66fq86sjn9df77bngc5qvdsnq/31731291214.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613758365147f---gomitamonupabivugukex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mha+2020+moviePDF 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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 21832 bytes
SHA-256: fb2e3a479da51175d65f30e3917a06d2a2e147a02c9ccafcbb51f5c692ab9668
font_01_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 10160 bytes
SHA-256: 2427da0c5ddce4eb4c8923fbe57e0b2f026ba2ee5f14825ca76bf6c1aa068e8e
font_02_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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