Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9739d4ab576a129…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 07:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45b07af252be43b67da0335adfdbf047 SHA-1: 7d264cc688e50b36191111d038b88c48c88aceee SHA-256: f9739d4ab576a129405d96334e66e00a3947b6fbeaf9d8cfd0e47ccb5bd88490
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=ocr+to+spreadsheet PDF link annotation
    • https://108pizza.pl/uploads/userfiles/files/54740140919.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8a104303---86689571570.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb0de6177---32122508911.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/jakukajarijofupidekom.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/43273014838.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d457ccfe8---vobejuvunikifonojakibakun.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/13318290849.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/posn3sqibno4sechn5l8vp1ab2/71505921510.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/didomebodemunenotugi.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/garumedijajofaxinikewi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q3rmkvafje47uueaqpdc0c0eb3/lodovigowumarudaxe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969572b5ded---vetiva.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/49955209054.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/55303488763.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/47777382563.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/10769865375.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/28587292586.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b142b13f---zonorixunofapuvumibowug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff809af89---20888510131.pdfIn PDF document text
    • http://www.toptehnik.si/images/rolixanuvosililopipifota.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c200ffeb525---kafasoduzoji.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/2310413371.pdfIn PDF document text
    • http://harlit.com/upfiles/file/96734175541In 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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 16848 bytes
SHA-256: 5179b9afca9075a21a35a7efa2cf9e72e36db173b58253a23feb2d9c4299c138
font_01_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 10392 bytes
SHA-256: f63e01b68abc69a36d401523c7470fbf16128738067efead8688773d671a3e32

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