Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb3eea108398363…

MALICIOUS

PDF

95.1 KB Created: 2021-09-18 21:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7848fcbe781f2db777e12b5c9ef51703 SHA-1: 12dd2f820f2731802f68839e51817d278609410c SHA-256: dbb3eea1083983636a0e895cff2926adaecd60c8ff4e5245d61f5c8f0ef97434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://vibrobeton.by/pics/files/nevidogujosavitunaxireku.pdf In PDF document text
    • https://pannonfinanz.eu/editor_up/51179956076.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j2d9nmhae9evqmop15f2kfn135/47164092410.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/10310164404.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/14797390750.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/26050055241.pdfIn PDF document text
    • http://cga82.com/admin/File/kimajokadiruvomolaj.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/3179261171.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/21724194656.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/zowuj.pdfIn PDF document text
    • https://kimcert.com/E/file/vukorovilelane.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/xumefazaviponit.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/ninuvoxagibagabimob.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8566a7aefee618053c47019e98417f75/20732212842.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4e688724fbf9a8d68313bd041f62d16b/62057725730.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/39117533249.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/32873162200.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/tidukotoga.pdfIn PDF document text
    • https://migger.dk/userimages/file/60713628428.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21091119065199498597dmkg.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/564sj0q9rids3t07u10dmdjd86/jirita.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/33267983796.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/cn7jocaa3anc3euo4bjtvoe1j1/7631500613.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/23260188283.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_025835.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/64921559710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+store+among+usPDF 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_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 10624 bytes
SHA-256: 647af1157c655cecff785ee183d27aae21609056c24ecfe472294ea8ab1295a7
font_02_sfnt_off000140e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E1 17880 bytes
SHA-256: 6bd6ee076f060c3b2f93f20c6210f2c34b2725b233df91576e9b81b511bdc548

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