Malicious PDF — malware analysis report

Static analysis result for SHA-256 285099689df68331…

MALICIOUS

PDF

87.8 KB Created: 2021-07-01 11:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 92659c823e3521281214806826da0b0e SHA-1: 8ebf212a801b2c449950a69e20e5afa02dff09e2 SHA-256: 285099689df6833181e51ffa0283ed2ecf6f12ae56520cd69649a1e73e0ee6be
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised websites and disposable hosting domains. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=two+masted+sloop PDF link annotation
    • http://af.ssla.ru/images/fornews/files/dujasesag.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/goxuxokirivobojawuzit.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8ab5be46bcd20625611c9bc77d8fe82d/18291828543.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/pulenomulawigixexesiw.pdfIn PDF document text
    • http://canadanur.com/resimler/files/52449552677.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/vegevabobexosiw.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6de985d839eb95e487ce218da317554d/sudisizedimemenen.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/71734256312.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a6e0097a---6609569655.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/wugoritis.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72c15440e---gigebajeboronapebad.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/5570344619.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951fcf1f60c---65099765699.pdfIn PDF document text
    • http://riversedgefm.com/files/file/69443333152.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf89cb783---wivipepimi.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/foxumotigobesuk.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/11155183841.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/44037276266.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/894b971437a789e5023b5d27024b929b/70149757986.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gqgsucoordej09brlnc4n78a6d/wogiw.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_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 10304 bytes
SHA-256: 3d19c9ea32cd5bed013352169fd38cc1cb568172eafbac3628005b24303000a2
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 16772 bytes
SHA-256: 71568a7ecb68ee372ab8e9a106ea23d4a181ddd19e366e2b2028e5bd7cf30da6
font_02_sfnt_off00013a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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