Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5e381a69517813…

MALICIOUS

PDF

93.7 KB Created: 2021-09-07 14:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab8fb9e20649d50c2bfb2873eddfd97c SHA-1: 7704610d794bb7a628909c989663d3627fa1bfba SHA-256: 9b5e381a6951781334394cb49caa54839c3ca95b63c235f0ff39cb9b839dcc49
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO poisoning or phishing. The critical 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a shell, a common tactic to bypass security measures and execute malicious commands, likely to download a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://progfin.pl/userfiles/file/mukolodapimusato.pdf In PDF document text
    • https://aimhc.com/userfiles/file/zosekepafenatuvaxi.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/72604377296.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/palixevi.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/polisonabejonib.pdfIn PDF document text
    • https://coffotea.com/uploads//files/202108070638256040.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2523452d---wemumiwixupisanigal.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/gajijabu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/maxufalumakulasiperel.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nixepaniwukim.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4f05175e31cc41052d387f4d09c2c17d/93404471592.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0lalt2qp7s72irrlusjtnfvtcp/fatununuw.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e912ca0d---9064203815.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/metetanunuxipuko.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/22016876784.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/33f2138efcaaf26b24fc297b26e8056a/97866353220.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/budatigigof.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160874b6aac37f---vitonuruzexidavibagu.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/97582022885.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/nunofo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/musomibe.pdfIn PDF document text
    • http://tfforming.ru/d/files/63269087225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+creator+ghostscript+download+windows+7PDF 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_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 18240 bytes
SHA-256: 268c4c2051b765dbcee6ba0b166383389f0601517044c8861af04523eb8dec55
font_02_sfnt_off00014f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3E 11036 bytes
SHA-256: 5e20f17c5a487f92fe880dc5fc825f34e67be6816069cba7a5c32f8264485931

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