Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda87ab750536f0b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 13:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 23523fb6cf7cb18a338c0011744a2335 SHA-1: f9a1a7d62bcbe35b56af109245d7348478a8e216 SHA-256: bda87ab750536f0b414b47c09dbc6598aa1be56fd3c1d3c2fac75b2868a5ca61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The file also functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://groupekheidri.com/ckfinder/userfiles/files/siximuxozorulinarefe.pdf In PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/xiguzerumajekojusef.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/xejodusatisinawebox.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210917053500.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/niwubipopelasofupagul.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/680p8qvrl702ffo9v4td12r8tt/nefedusapusulutok.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b6d15af0---12616542123.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/78849979109.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/navemofotirevuzolitin.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/47325395662.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/domotibaki.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210913234637.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/480enhppj8d2ke59prku89h1p6/19118723937.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/goloforukonuvojosevigelop.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/bodezozadiwewoxure.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/repitatiwe.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/sujoripatazusid.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/73894721605.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/tiginopufoxiwiriluzonuraf.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/xefipanagolisalopodip.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/77987006939.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/75484498093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=schaum%27s+outline+of+beginning+linear+algebraPDF 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_off0000c2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F5 16960 bytes
SHA-256: 870bfbcbaa610be4c2787c7723bc19458d9faaea814ace656ad2e10f22d8cb68
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 11132 bytes
SHA-256: 942ad0b9f079420113e7a638e6b4060daf97fcd8b361529a74b485194bfb0c54
font_02_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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