Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b728acc38b1ebf3…

MALICIOUS

PDF

101.9 KB Created: 2021-07-08 12:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7a6eeda8941e842d018c7a0e53a93285 SHA-1: ff48017a1a731b54a6034e75a190692af6510ba8 SHA-256: 1b728acc38b1ebf32c07539c7c11e51e746cdf40ac005cae888d47fa9c3e89fc
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 Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics indicates a clear intent to lead users off-site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9431c6f272e33f8b824d7bcf3a6dd425/dawozusapiwenedujopasowux.pdf In PDF document text
    • http://www.aadhar-interior.com/userfiles/file/57060975983.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd7de138a1---52455121622.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c22952ba82---87826178365.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ccbe5c3ca2c0d6d2558a95c6ff8f2cc2/nigefuroba.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/2341950360.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3c4ec575bef0a1bb28f18a8bdb461637/63318129260.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a1a5db07---zebaximafiletetukamupixo.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/46316899159.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076938e084a4---3969640691.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/32eda2cdba59a4608ca2bdb0c723fcdf/wujetivuwuzetize.pdfIn PDF document text
    • https://tappowine.com/file/kudazoletusozi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ejfm2koedo54nh4088979ed0u1/30339986754.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/vumefedo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f1fa09239dbf0f1b7b2b4493d63a037d/bimopo.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/dodosuvesigoni.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/gerufibusita.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/noduserobupu.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/32106586406.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/11cb69e88e29a8c949cf8a3dda974ef4/67892827410.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609724c33764d---4735155252.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nulanefibilixap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chinese+rural+dog+for+salePDF 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_off00012d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 16916 bytes
SHA-256: 134022f29991a3dba629d11c3872486cd4235f3e2450d6da34d33466b0d2a403
font_01_sfnt_off000158fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FB 10668 bytes
SHA-256: 773398ca672a387fb27372815a8aed8ab87eb65d84961094acca8d2c9bf39729
font_02_sfnt_off0001711f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1711F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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