Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51ea46b0d2baa8c…

MALICIOUS

PDF

84.3 KB Created: 2021-08-24 19:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 903379482f84da4a30b9ffc84385672e SHA-1: 939a961f8a214c366a2d70357eb96058e25e2460 SHA-256: d51ea46b0d2baa8c5c789f331b3e11a0e06c49d110b59964a8e8c4b24f9056ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0ecdfb16f8b1febd67471550d2b25a16/nagelekifoxe.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca663a4de4e---dibufoganepivu.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///9270060710.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/aeda50148b1f8438c40511f633ab9d2f/xosifasowi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47e58ba31b---13766882415.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/80337281240.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/51151575526.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/063fd5b41ee749de4fd5fa210e114bea/gutoredegoxezefekojeda.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/48ee57ddf89f94d5949710c928199e9f/68950258687.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609570b461cbd---35224047257.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e635f6ff5a---40246485685.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210724_131718.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c9e1caf89e5d06b4bc4434ffb8f1b26d/ponigewojetojarikarejonu.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/susigas.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/cb09866192de952b8c3e9879fc4fd5a8/mamijivuzikipakirim.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rukitaxijidiwedoxanurite.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/26750352809.pdfIn PDF document text
    • http://bdn10.cz/files/file/lutibesoruxetivozisujog.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/xunib.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/gilefizimitidiguxef.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/uf8n9b5nip4lbvskdcr6t8cvo1/42256105825.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092550fc1e9d---85164515184.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4fa6fc87---jolowexiximilikavaz.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/27520266016.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16244146388825.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/38341153933.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/80527572365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=parts+of+a+thesis+paper+pdfPDF 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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 16996 bytes
SHA-256: 91c5247ecf3be7df5c360a8d257bbd23930d4c267208e88347d55580efd0d89b
font_01_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 10448 bytes
SHA-256: bf053a702df1cb0f4eefcea5140aa286360a1f23941946828a5c5a616c3a3c7c