Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19050c3c1235250…

MALICIOUS

PDF

92.1 KB Created: 2021-07-03 19:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fcea2f96241e1d7d36b1eb9815799020 SHA-1: 06b5be862130b430f95c01d6697bbc16cc07498d SHA-256: a19050c3c1235250a72f35142ace4a215ccef3c2a6a1c361670bc1806e75fa3d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The presence of multiple external URIs and a link farm on disposable hosting indicates a likely attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://beijinghuojia.cn/userfiles/file/xubisaxel.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4479b738237d016139bd4dc678822785/nizirenal.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/5859766178.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4d91c0be5a13899a2fb6770714a7c875/kufalexasekip.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/voguji.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/30tv9ocsgaeflohub35nknhpts/ranewogegiwagijopeduna.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/96690054383.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb1678952---batekuxixomonufux.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/nosodesotugagibobaduxebiz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/71loer0u00ir5ip4t7a8dmnf92/merorowurusizokolijuj.pdfIn PDF document text
    • http://strandedtattoo.net/file/65035056830.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6328c273---97098209878.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cccc1c7d6---10641889716.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/58614743322.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd68ef1bc---kagalonirubuximifodag.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210616233112783.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/nijevolas.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/bagabezikapuwuli.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867386b05cc---jusowuva.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4jguc02ttfjlp34clj598r8gem/piluxedumewe.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/luweparono.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/42184964216.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143f870a23---58046270308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+clean+sharpie+off+of+plasticPDF 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_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 10652 bytes
SHA-256: ffed154219c1773b36776c6527d9aad00f23b095ed6294793b8c97d0197eae7a
font_01_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 17700 bytes
SHA-256: 2bf04c5f2c15220d4b3427604bfaf6c89bcfb699691bb0868dd3a5ab45ee23ae
font_02_sfnt_off00014aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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