Malicious PDF — malware analysis report

Static analysis result for SHA-256 96830e8d06550f4a…

MALICIOUS

PDF

105.0 KB Created: 2021-09-04 01:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88b57125844293ad2f531c65435c5fbe SHA-1: 6f453c061813b721d34f2d401740075bf38ab1d4 SHA-256: 96830e8d06550f4a7848d9567574fd60736e2bad20f904629e5fef521ca2ece2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://altelaw.com/uploads/image/file/neseko.pdf In PDF document text
    • http://rheumatology.instituteupload/content/file/27865896881.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a2c3f47f229d90434d593766a07f89cb/63533591578.pdfIn PDF document text
    • https://almavilag.hu/files/files/92217174975.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/piferurazewidotuxelobe.pdfIn PDF document text
    • http://ridendo.cz/files/file/29055705754.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/gosoxuneturexobe.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf26c9bd7---19575854361.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d977a65c1---nerukezosagakikoloz.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9f59e375c---xusuzizexixezajumabatotar.pdfIn PDF document text
    • http://wami.cc/data/files/sigoxajowemusofew.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a582f2d02---donakogabagajaw.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/mefedugamonubutu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb031c8536---84741132963.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-20/20210720034856826775.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/3178516950.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/60614fd1259ac9f7a3cbeb7f3c757baf/nedotasezotiduwan.pdfIn PDF document text
    • http://kd-council.com/upfile/files/30717398644.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-25/20210825035824672953.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d9215354---63147399618.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/xajazoxir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=prb+act+1867+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_off00013760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13760 10568 bytes
SHA-256: 2de7594aa5889c5bc93b1043bd1b331fd72b8b579454d5a0118260c49d6aff93
font_01_sfnt_off00014f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7B 18188 bytes
SHA-256: 799f9a9184877f89b6d5ef3db9d23c476b38e67131f6fe5f14714b773c6a0276
font_02_sfnt_off00017e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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