Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e67e1c3192cb8c…

MALICIOUS

PDF

76.4 KB Created: 2021-06-10 08:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a6d9a0383e6ec6da61be4113fc286a5d SHA-1: e7d6cd88fe7dd1f971d7601cdf7db72969bc619b SHA-256: 13e67e1c3192cb8c946f1ade565f5a8626f2c2e497a1c89843d710e569ede6fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The embedded URLs and link farm heuristics indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=good+morning+wishes+with+bible+verse PDF link annotation
    • http://ottotech.center/userfiles/file/53301782899.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/tebutegovojegavolimu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986cde6cf77---fuzivefivuru.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/vp9m8q9bah5tqvejd56of7n3a1/2107444131.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2740bd13---tuworejexunomojesowuroro.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/83741211959.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077020573b41---jemofepafaxalofa.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1cd75c76---47116309908.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/mefufage.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/03595c5692b70ff360923bdd284a6927/vokegigezejividi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/5457184067.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/parotonajavepakitaruj.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/nakekenawonaw.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/vajeteziso.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf8dd204d---31041929830.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a19e61168---tozisurekokatotanudavileb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 5352 bytes
SHA-256: 7a715b90b49cc0d17673c536af801e3de8820828b53b1d53fcc28cc739e6d8e3
font_01_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 10544 bytes
SHA-256: 99d46cff2c0a495ba167d8db1335c42ac9725f9c3ae1823ec7d453f82e9d36bf

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