Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21a98936da6eae9…

MALICIOUS

PDF

77.7 KB Created: 2021-08-22 04:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d913054382a2cb9a9f5d798ad446730 SHA-1: be75691922c26c0a312542ac9dddb2b93f2e66bd SHA-256: b21a98936da6eae9179c03d0c24bdff2675c26e42d973a8e85ab51249c02e4f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://envida-nieuws.nl/bsb_website/upload_fck/file/55682832653.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d15417b60f877eb2b152477207301c08/lunesatibutanifidipeda.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160829daa36281---lujimep.pdfIn PDF document text
    • http://npas.ru/pic/file/9628981966.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/menojinotakoxurikovufoku.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/fupugowuzerevuba.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b702be7c---347731230.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7bdf8e2bfd---mejemukezetepumi.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/55191957584.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/40096877261.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/25445096682.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vovarojixefowore.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/43140369754.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pi61dne96574cjb34ro03qfb9b/30959380449.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/15677850653.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a823cf5f---86092612830.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/39526212698.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/14140829733.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/69fe7f31e9248ee02e4a8706ff5ccfac/32544395082.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/pagoriwenul.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16287804743649.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3bd3d62e95eb11426e287413da58b4f8/lituzowomovojinuziru.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e8cfd99313f4e2973c6e508d3fcde64d/62410251747.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/pibusimavivanawedekoxu.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202108152015147253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=khesari+lal+bhakti+gana+dj+song+videoPDF 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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 10944 bytes
SHA-256: f3565f8d4772a2df18c9febd5fd758cef794630b2836d94d934f00a781fabbe7
font_01_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 16928 bytes
SHA-256: 634c0a31ac66f4f985b77bff6418e0f2b4e891f0857f3f400c720ee1c0944dab

Open this report in the interactive analyzer, or submit your own file for analysis.