Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe0249f17dd270…

MALICIOUS

PDF

82.8 KB Created: 2021-07-18 14:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1168c333fec234a878b9c322d8560e0 SHA-1: 84301a3cca9d12cd5fda80bf4420554732690e42 SHA-256: 8efe0249f17dd270a878cbffae46c67f7d2360ff9e3127364d0e5e2eaf423d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The presence of these links points towards a phishing or redirection attack, likely intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/39094248276.pdf In PDF document text
    • http://robalton.es/Albums/images/file///64678034540.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/rojugevuju.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bbc7c2b2dfafa105027b56f0ca386eb2/91438239545.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4a41d082477a1c6e5f40940cae8acb44/wilojofikobezebatolim.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf5674161e---femalamunamoji.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4c150bed853d98b13238b434691660d3/temebowo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce82236ceb0---mawixukelip.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kisududokobanedadal.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/35818f8551536c17bf929ddf6560d8b0/28673949294.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcfcb06725---taletuvodopufemovavubub.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7jb2lj7hqo9nl8ndphpal6gelb/suvoxix.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247dab16b7---gojolatifikivoziwodoti.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/texamemugo.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085750054002---74791934166.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/zamon.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/s9b93l4c304jtrve6fti7ps9o1/82449388995.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/da0a5196806154c11a53c89ac8d99782/kitonakipojabeluvode.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/mekelup.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/vologutusowojutadifovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=baby+unicorn+colouring+inPDF 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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10416 bytes
SHA-256: c6cda336f379c292ae4bf686c9ceb9913725b4e33b290d4baaf8df26ad6ec285
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 17400 bytes
SHA-256: a22899694923750b44c54223f17da19ecebbac03cccf0cc9f26a395b2c93b581