Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dd529a2914c659…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 16:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0116c6ac280e26fa2e828ed9244ce06 SHA-1: 7e3e68c83ca3100bf5517779cad982bcf57e192f SHA-256: 09dd529a2914c65995c78cab6dc848a3c02835e030351644c06820981d9223fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://livelyway.com/ckfinder/userfiles/files/wadofujaguwoxupoj.pdf In PDF document text
    • http://cmrivestimenti.com/userfiles/files/mazapenixobo.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/62257178986.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c721a04a7b---35305734174.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/tazosebenezozi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bf453dfdd8106ec3acc5d495999af318/judiseposopabu.pdfIn PDF document text
    • http://01host.ru/userfiles/files/jizirerilojuz.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/9153167446.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/neruv.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3bd7e65bb81feace047ff19af1ae022b/vevajuwabameretavezegumof.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zonedodubozetebak.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/wopamujusalelovazegebasug.pdfIn PDF document text
    • http://erdbau-rauch.at/mitiwubemeneregozelovixu.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/49390819459.pdfIn PDF document text
    • https://irrisyst.eu/files/file/64155133703.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/pobekilujigufus.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/43304858627.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rabotemibip.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/35190114633.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e97bb318b---tazagopusiwifalajumanol.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/37991056412.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/wanexosuxowapinufodukevi.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/ladalefo.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/jajozopedaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=you+can+do+it+book+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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 10480 bytes
SHA-256: 625e0fa969f8daf9cae53043c47629f0dd704db204757516f273ead18314feb7
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 17848 bytes
SHA-256: d21c4cd3f590ef0b6b496437541ca9310c1d7e0107bf60ca37728ae25dcac2ec