Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4a5c58e75cf580…

MALICIOUS

PDF

131.6 KB Created: 2021-06-28 15:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 78957a5a65d5eded64427e7de9b762f8 SHA-1: 416718e94e7b95a76d7bf75fbba946193b7d6099 SHA-256: 9f4a5c58e75cf580415555dc98651b57b29dca26cdb4bfb4891fc8d2ab80b7a2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS upload directories or disposable hosting. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9701

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://oniceh.ru/uplcv?utm_term=object+of+participle PDF link annotation
    • http://xaydungphongphu.com/uploads/files/zavuxorusedikiw.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3f9f75824---vujoki.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/29903176002.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/28334010470.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/efqkjusrsirfsrpd1nohreotr7/xikeniguse.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d25873b06291641931e8dde3b2c79d9b/sikesunuzibolebusutiji.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a704cca279d---zobifesaxolegavikaku.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46139e593---lotuwefatajijifusen.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3003a84c75---60199896660.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097276c5cfdb---88733723986.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e21254bae---39083790696.pdfIn PDF document text
    • http://elma1.ru/!upload/files/jiwux.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93c3dd48a---11594786502.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840fd0d5d55---guputebapuza.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607644224ae63---fomerokuboga.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/28577952484.pdfIn PDF document text
    • http://halaljones.com/uploads/files/rinivedukipoxaduvogari.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d13366bc---81700438021.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e952b14841---56247660416.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/c1b47ec640247bf8b02960008a2907e4/49084997449.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aa441cc2217ac83c974c2893a2f2b336/86659722048.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc74bb20f8---jujefipid.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/86e55ccc7955408936bc055dc92c989e/90210384670.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078986387fe8---givezadaxuwexujijevidoluw.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/8555240352.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbce4cfe9d---5254550147.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001582c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582C 10496 bytes
SHA-256: 406408674a232958a58dc622ee4d21d7c086667a98ace9e8c76283aa1dcda480
font_01_sfnt_off00016ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18801 21540 bytes
SHA-256: 37346a18e62a0554d807683e757f1e8b33e795407fc45e974dd6fb73d022ce14
font_03_sfnt_off0001acf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACF4 36512 bytes
SHA-256: 24fc8942fdeb339e7eb62e6ddb7a0d7086d8e21559f479cd0fb696a8fc95b669

Open this report in the interactive analyzer, or submit your own file for analysis.