Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adeca30497ad981…

MALICIOUS

PDF

83.9 KB Created: 2021-07-13 14:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58772b502947e6d4c38c5ca3692f46df SHA-1: 4dfead98e3a4f4d1a349cfc5d165d6ec307341a8 SHA-256: 8adeca30497ad981038bbdf653256ae4884d66bb5d08331fdd758e7b05251059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm or redirects users to malicious content. The presence of external URI heuristics further supports its role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=convert+pdf+to+word+doc+online PDF link annotation
    • https://efficimm.fr/userfiles/files/fidulorisakizasemirawex.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/13024857891.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00125f674---5560912871.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc984b6c1f---45163692290.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d741c7943d6---gidoxowexigor.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3e2199e8---gotako.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099a7075f69b---guwefirovaxafudaz.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/levinode.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc67dfebe---xudopofimakegofa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2ae935be99cbf6007b4a7f05f0a634ab/72971766215.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nuxivikiwamokagezowave.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fe5ee9f5ff528ee5dc84fc9a775cecb4/dosagerugiwigironewuvo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/58994696452.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8c08dab81a4bbebb62a779f035f6ceef/wijukozote.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kia74fip1mfujmljip2tmg1u0q/dujitut.pdfIn PDF document text
    • https://superchills.com/userfiles/file/taximojegesowipodinojuj.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607598e16b695---43223401588.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751a1993e8---94020394383.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d71282a4428---43072971962.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/sezamedanu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/82234315555.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/91504130447.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e409b0b8a960da76873092eca8109c88/sesubu.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/28698017178.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f407e803df---xuzoko.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 17260 bytes
SHA-256: 5494cea8527b612bca58477ed1ee8e4e153acd8fe9dd2409b94f7a6ee63cd499
font_01_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 10468 bytes
SHA-256: 8e268b33a0adedccd7a3f6300bdf0ab189cc333774c0ef1420facdc5f879b427
font_02_sfnt_off00012a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1