Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf33f9ba11be9892…

MALICIOUS

PDF

88.9 KB Created: 2021-09-16 07:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a09e2451f842cf30f21a8824400f040 SHA-1: 027d13381173bab15c9417ba30aa864be9ce85d0 SHA-256: bf33f9ba11be9892d2c4b2a4542c2b90f5dd4315ae0ef6fd275fcfff63788b5b
172 Risk Score

Malware Insights

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

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to trick users into downloading malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The ClamAV detection and ML classifier strongly indicate this is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=masm+tutorial+pdf PDF link annotation
    • https://ciiinnovationsummit.com/ci/userfiles/files/nibinusokumusarej.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xeburipisezo.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/mumiletawuzilazuzegumovid.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f0c0041b956b0fdf903d960bfbf68a3/51738909101.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/54500345750.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613685bd8f5ee---20097966042.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/gusivafan.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/sevukazowaketomaki.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/rodavobuvido.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/65471487383.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fm0hqav6h7vgl8oa67pmpi0s2k/xirepemadaxados.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3069ba37d---ganewe.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/didixorozolixoze.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/563aeb3ad461d35a3889f3b49e23297b/4843578657.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/40315105155.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/39566429853.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6d408f920295577486c30b6359031c89/54866855675.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/23543893873.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/54106616189.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vekitunapazifarom.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/27493580201.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/19880178141.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/povilaxufukudatelagipa.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_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10516 bytes
SHA-256: 92fb3a5ec96c4cbe05f6d5b7a5ae5d63f326d33fcdf5a44b6c813390af6c14d2
font_01_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 17776 bytes
SHA-256: 923f112aa96e6c8a5c8ba2214646f7b662d8900785bca73553d13f53b259c0a0

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