Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee65068718dd4937…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 07:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fee6dd79fa8ad2896e0d90fac1539ccd SHA-1: 93c99198246b0ce0254d7bf8eb87fd720d3caccf SHA-256: ee65068718dd4937802f293c34c0ae0f2ce9f2f556bb9cfcf5b24a3c1b662eed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on a variety of domains, many of which appear to be disposable or compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xn--b1akwe.xn--p1ai/userfiles/file/tajanixokewobidus.pdf In PDF document text
    • https://bizimpin.com/calisma2/files/uploads/rusiromix.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/45086408387.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/14683634673.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/178a27bf5fd3638b8e58c2b9dc508ce4/12020259091.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/19344110834.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/mibuwe.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/dopaxuvifefototopenu.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/vumunuzulasupiv.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/4527272094.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/cc1f145984c93bc83f2d04991ab38567/tuwadukevumumunakox.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/vagazitonejenibo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1dd7169d---553012637.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210913013418.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/45965765610.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/6721755338.pdfIn PDF document text
    • http://veitali.com/upload/files/mididerukogiba.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161386afe85cc9---musawedejavo.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/12776055274.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/kebavosugotebibeg.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/15757890199.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/dobajiwunesuritado.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/34049953998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fotoo+premium+costPDF 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_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 17768 bytes
SHA-256: 7b1a8ff20b5b5bc3eaf859194d73e33a22d71a4ab1f2b87a866a8ad5443b0f8f
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 10300 bytes
SHA-256: 44707f72d49d589cff5714aab632008941b72cf9803ac8932e2f593ccb1d67c3
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1