Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a2e49115c992da…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 00:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff246b79f6aa2e5f293a500676b78445 SHA-1: 704900be8846ada89737165fc15e66e4f8f6f3bd SHA-256: 67a2e49115c992da00b08e4f767f9ef84380975a9470ea12bc9a0d9974e27634
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also contains numerous links, many pointing to disposable domains or compromised WordPress uploads, suggesting a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pereplanirovkaoblast.ru/pict/file/xezanofuvuguzujarigelik.pdf In PDF document text
    • https://ms01bet.com/contents/files/54753293524.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/93486634342.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/80186522971.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/vajezediwuguduxegu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cfd03c7647f7864d8e3d8eb26f341a6c/nisanikudubazos.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/kudomiradopunuwo.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/49769898074.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/gijazuniberuwewapizurenok.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/garodafasadit.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/44669963745.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/91613127057.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/72912372371.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/ninezasizusewukovari.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/44996056593.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138434e2bc21---zowinonewawerarepe.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/43032452122.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/fenenopupenizokunifisa.pdfIn PDF document text
    • https://gornjastubica.hr/files/baluvurunenisobilutixurol.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/20091029396.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/2665902505.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/52849265263.pdfIn PDF document text
    • http://chpcentre.com/files/file/numazakolo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613985f9265c1---sukujadalewokopagotimupib.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/nujotinaxopekowurejiliri.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/63245419597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+emoji+apkPDF 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_off0000bf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 17956 bytes
SHA-256: 8e10dcd6487948f4c37660b3331463240660443a0e2897ae543d176df2f0096d
font_01_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 10496 bytes
SHA-256: cf90fdfdb59b73d35ac0677a58d597630b394ce92d3cea96f6c77d0d0b514670

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