Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6e8ff123631526…

MALICIOUS

PDF

89.7 KB Created: 2021-09-14 12:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db15f6c16660cb95bc06ba5d4b1a0eb5 SHA-1: f063cadcc1dcd4495f4ffde175032908d9eb840c SHA-256: 0c6e8ff12363152622766860a0ff25b9f279f15e6c18f4039fee11dc8694d687
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://de.ruben.pl/ckfinder/userfiles/files/jigomegurogesavomevameran.pdf In PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/zadojavakipatujogazupa.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/26784566980.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/43945534522.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/48059642432.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210914_0284E959114891C3.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/kabofuvumonidad.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/vogujesajotizomubonupo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tlst4ha22o0veb216gjaedpiip/sewedaniraturubozon.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/52885017506.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/joletijeg.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa5689548---ridojadanitalitorabe.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/7370212854.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/gunavumax.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/50611254072.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5c8f95317b0ca9805cd5699c6f7c8957/66220000421.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161328e715274e---39186921193.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/12511718956.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/35675432271.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wewos.pdfIn PDF document text
    • http://htwy.com/upload/file/viguwanedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=xiaomi+a2+lite+rootPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/64985616726.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_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 18232 bytes
SHA-256: 8cd5fdce24452e6910959e4a00caeffa0c8b64dc00ca7de4e15bc7f10193a31f
font_01_sfnt_off00012b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 10124 bytes
SHA-256: 0988fefac6c9607137f64a37637e08ed5287511e7050bda0c4cf15a93d49fe26
font_02_sfnt_off000141da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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