Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf740bbaa1be2cd…

MALICIOUS

PDF

99.6 KB Created: 2021-09-06 07:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 193062f9e1e1fd5c9c6bc5d2a9c91d44 SHA-1: 69363bf45e7da15bf70735bd292c48de76ac4afd SHA-256: adf740bbaa1be2cd279ebc1b6f331efc2d7c3fd7b82eaaf0ec995ace8100cb81
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs, some hosted on compromised CMS uploads or disposable domains. The primary attack pattern appears to be directing users to potentially malicious content or phishing sites, leveraging a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 http://aksaaydinlatma.com/img/editor/image/file/tarigipibuvo.pdf In PDF document text
    • http://ttmplus.com/userfiles/files/36455415852.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2aead6838---wotaror.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/95617627882.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/97014882185.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/25809249188.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ebe3oplsbtljm9qegilh7ftcl2/towetaratakalijiz.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/fudaditakifelekuxezazinog.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1bcb76357---78332074689.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711bd7cbf55---62254663034.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a69239c25a6---26657472752.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/fefamip.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/gigamudujodunewikej.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609735dfa3252---vikusawunegitise.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601212931269818.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8adcc94b63707580fbe31bf9e953cf27/89106590551.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/romos.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160818a337fcf6---nejosulefa.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/56627141456.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/mokolijimaserezugozeral.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/debagotobi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ee9f0fc77---77906718608.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/87665499075.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1cb9e7be94383202b00e3463dacdcb16/jemanesol.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bcca2f73a2e---gelumomufabo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d310a087888---falasezoxovenajikubevazi.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/fudutoralom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=units+and+dimensions+jee+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_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 20296 bytes
SHA-256: c140296381a3a5e71cd160e28d22023aba7e2cfc9aae3ae7f249773957e3aacd
font_01_sfnt_off00015066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001687d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687D 10648 bytes
SHA-256: 1e11337c2ceadb53d39614ad1f6fe7697955900f4c4266230231e64f2c55f551