Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f10b7b37e58d20…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 18:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: c28cb1059510949a9cc89f5dbe801274 SHA-1: 716cac9caf1755a8432c69041a304bd9d2c02de5 SHA-256: 06f10b7b37e58d203b3f3f8147f17e948d91dcfe9011eba5e951a7b80d6c98a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://cape-electronics.com/media/file/19492103655.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3e1uqe10kt217gbig1gfek125e/15086888189.pdfIn PDF document text
    • https://werbemittelag.chupload/file/26769152752.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/xeraduga.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5f505c0feaed58c3c5e602863f3f3d7a/mixovoxebejirujisewug.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///saxibabuk.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051012382973499.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab5ff2ff5---51938142063.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/17654682729.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/wududenagop.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/noduqdoepmhnq8g82vr7nsdfvv/48958812928.pdfIn PDF document text
    • https://immobilgold.com/file/xafatijewajubosasigozeza.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c9888950---muvilomesu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b563c4c7e---gatexuxemituzoriti.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d39bb399c5e---12905995919.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/66069087804.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/50581533242.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823244e5597---mapuzopavixegixaxopov.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc5807775---lawisakebizib.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/jegopitifem.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c0c0119e24f4d6aba0c9fbf998bf3bde/259428008.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/forelobefoneraxopuvegulu.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/suzepufufikadegurulumew.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/16855489303.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2d485121d2218887ac4dd68b6fee9ac5/vutevifitonolusenemojoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ict+to+cunPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 17696 bytes
SHA-256: c83e230dd582bd059c70a841d634c287c46f022fbe4d8a99bde4e16a09b21775
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 9576 bytes
SHA-256: 734c8d2bf900fa945ac7a5c4b267ff8bf4a1903af398e29a27114043bc01680f
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd