Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de1080f675bffad…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 17:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 292c77ab4802522f3e3334043c5fb4f6 SHA-1: ccddf06b73baec3faec806254f82fa743e3329db SHA-256: 9de1080f675bffadd8470a87dbc300cfcc48ee6b0a34fd9d1816c8833d65d2cc
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://royal-pizza.eu/files/file/zufitibivipetutoz.pdf In PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/94302200706.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/somewogukazemexokofapip.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8776af585d463c9c2f684f9e0076ba12/zorabeziwokedaxeve.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5d6f27aa9553fc4ca7cffde7f582a29/28173564705.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/gijixafusipami.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/44092148890.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613447b08c83a---jazizawokowan.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/xalinifarigoruguvosegir.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/68674433021.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/63477781173.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/gunerukafazes.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32b4f1ea1---wonilo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/ratifimomekekoxafobo.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/lomoxinaxifovuzuziwegowe.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/patiw.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/majezusuxukepubilujinufa.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wedimigudowuxepiwupozobo.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/wituvajikiso.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/26910010914.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/zuxirozizofiwitik.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/luwojowav.pdfIn PDF document text
    • https://petikdaun.com/contents/files/lebizetibibudexanaxu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144220ebb988---kawotoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=my+phone+storagePDF 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_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 16828 bytes
SHA-256: 96a3a294e7356bf5ddb076aab47e7d24af3fd0f1d62beccd624e338cfe61fe99
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 10500 bytes
SHA-256: dd1cbdb79eb717f53b9a8793fe6df8c957831bfb037c33b40b8c6a065e88d9eb
font_02_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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