Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cbfbe0efa4028d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 17:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6814a2564af5c2a9dd34788f350bf12f SHA-1: 978fc083caec03db5e100894b805723589d7f068 SHA-256: b6cbfbe0efa4028dbcdb2ad4accb9b6c6bec758645ea5e970d4e3855d5e87147
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination through numerous small, distinct links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nomylo.ru/uplcv?utm_term=us+bank+apps+for+android PDF link annotation
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/4381796964.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/96ga47do9r0ethl44lo6jqt53n/21023842380.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/fuzenuzuwakigafa.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/dilanabidadulareduwe.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/viwufikaba.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/xetezidesebiwaruxox.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h8b55ftqphhcnacgfrvk6k0roe/48945814356.pdfIn PDF document text
    • https://vzglavniki.net/data/file/pukobefulewexi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d7v6qs83lspp0rcagibp32884l/gojuvomikevimame.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/bozasosabano.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/17954024002.pdfIn PDF document text
    • http://robbes.nl/media/files/40877283627.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/16889911631.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/fenanobodasededarozupogo.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/20857762951.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/dufosigodozufuro.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/44093021914.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/sowubirusexobigi.pdfIn PDF document text
    • http://www.swiftsecurehosting.com/rsnpromotion/siteuploads/editorimg/file/mazitivagujur.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/12349734553.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/64335786477.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/57958066978.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/gojedolisepujaku.pdfIn PDF document text
    • 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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 10456 bytes
SHA-256: e88f6266d924d5f652a3e2398bde98dab50e2f5e72a57c67a63cab2c29f17bc0
font_02_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 14980 bytes
SHA-256: 47ddc1e0a2c6600bf81196975ff380475e354800d285a2f03b3c75a4af7bde16

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