Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eeb0992da48bbe6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 21:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc02121f3a23233c6d28d0d175968fa7 SHA-1: 9cc6ca65b215609afca710b2138a7f8df4bd00de SHA-256: 4eeb0992da48bbe695662f3313a286fe6651df3391e11d5f81cf14e71b0e8b16
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains embedded JavaScript and a link farm pointing to disposable hosting, suggesting it's designed to deliver further malicious content. The presence of JavaScript indicates an attempt to exploit vulnerabilities or execute code, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2027af535a67654495dc28a5efdeeb9f/94342306888.pdf In PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607892c1d2b30---17605553675.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/xiwolosoxinixepibet.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210906180837.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/kolofisutijolamiz.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/numaxabuxezujajofisusiwel.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/64015473449.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160999f2a22188---93171732183.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/rinifudofipekuboxubok.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7b1ee3cd---44127778658.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b451e45b0---56781211897.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/f7b85cdf329d6e62002119986d991669/koxopujip.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/8620f4d806f48f90562e0c3a28a70754/wubuwimisis.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f000a92e26---2841812916.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kokuvoxavirakokik.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/roseboladidejedemokeleb.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/63497485189.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ade1r2r84d3ct39c9rhgv55md4/26985999253.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1psjp3amn63gijec0vo45r52r6/vuxevix.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/rosuf.pdfIn PDF document text
    • https://kermanrooz.com/img/files/62222088446.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8069272d27---42747970184.pdfIn PDF document text
    • http://promador.pl/userfiles/file/jinapiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=abdullah+%C3%B6calan+kitaplar%C4%B1+pdfPDF 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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10868 bytes
SHA-256: b98a1107f40f6837d14df00c6840c0e84f4ddd0a5107d794e933e344c791e861
font_02_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 18864 bytes
SHA-256: e1e2e484950a46a5032607bffe6bd6ee32a11a92d3a529c47f5feebaa84e0dda

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