Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed99dd1c23d3a863…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 14:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6808933e9de1dc48f14cd6d30b7721a3 SHA-1: 3e123c05bd510a65d1b5e90f92cf6f92cd13335b SHA-256: ed99dd1c23d3a8636f49444209f25ae423aa66b38ed7cef9f462e8a6ee47910f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs and link farms, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cructi.ru/uplcv?utm_term=kiss+of+war+cheat+engine PDF link annotation
    • https://vishalahospitality.com/ckfinder/userfiles/files/zanigamupolevegi.pdfIn PDF document text
    • http://www.agot.pl/upload/file/54873400916.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/15029149125.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb1621f3f---84016345415.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/zulubego.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/13908262028.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/68548996818.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/15682954539.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eedfeb1510---57480961475.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/57871293219.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/ramekalapa.pdfIn PDF document text
    • https://ibextrail.com/editor-images/foxerenudub.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/12441261227.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130686ed4dd9---videzogitukuzojefapa.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/sipemogogo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6e4b208c---tikupu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/92145217693.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/9087203920.pdfIn PDF document text
    • http://www.moyekolodin.com/files/48148148245.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fc6a585f---12331390954.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109082216105340.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/xadosolidok.pdfIn 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://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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 10648 bytes
SHA-256: 942ed421c49825c3d5afa7ae3a0bb5f2ee9e5822b75f5f6b36fcfac232db8d79
font_01_sfnt_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 17112 bytes
SHA-256: 2764babafdfd6647bfcbec9054b8f5aa282ed49fcb81ab95ea1bdb2f3adb4c98