Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe9a806df165eec…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 17:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d31fd1ee72afb51f656e86c5e9a36ee SHA-1: 65cfdfeacf7cea1247d7d9da6ced79e9759d6578 SHA-256: 2fe9a806df165eec7f40b0397acecc8bf266d67692b833e6d81e8532e4c221a1
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'utm_term' parameter in one URL suggest a phishing or scam attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8901

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=change+passcode+on+android PDF link annotation
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wezofurexaw.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nikojalasobekalopa.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/votemisopumamubok.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/92832724212.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0b79d9e48bf47e701345b1b84f151e8a/vunatonugokedelerujanerit.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/7446976549.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/94060283482.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136bebc139d9---bekimoguwubedebe.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/86158796623.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/tofonibozen.pdfIn PDF document text
    • http://cutskytools.com/d/files/fugodokodanowononaja.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/tibexedeniko.pdfIn PDF document text
    • http://lejonhund.com/upload/jaribolimuzokadexegodate.pdfIn PDF document text
    • http://splogservice.ru/content/file/zubel.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tefugudeluxolixirijaxa.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/26440734683.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342fc62dd6b---12913416198.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/4348264839.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/13514542308.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/wexisopevozanibi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 17912 bytes
SHA-256: ae4eb4f628be568281dd41b75a6bcb877d03c1f7af179161551da1a18f18c6d4
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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