Malicious PDF — malware analysis report

Static analysis result for SHA-256 0786be1a7b76bbb1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 08:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 740326cf8b05f3b97552e343b1503891 SHA-1: ecdbbde5656bcc5827c58ff1d9aacb85a1fe773d SHA-256: 0786be1a7b76bbb1be0b16ecfcd6b9bde74f459130bf6c79125e6ed90c38762e
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=student+evaluation+survey PDF link annotation
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161352bab215c1---nupemefurolujakogawez.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/dapolesa.pdfIn PDF document text
    • https://pratham.one/file/winewejofutedum.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494295a708c---81436212716.pdfIn PDF document text
    • http://glttek.com/userfiles/file/83983382616.pdfIn PDF document text
    • https://digiconelectronics.com/media/72733476905.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/dupeviwut.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/sadadekasa.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/pizisejiwivetuvir.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/1159542733.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d0b3fec11826ecb7c2a7de9450fc2820/jezegoromarubofuxamesomar.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/73315593432.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/merajolubariw.pdfIn PDF document text
    • http://pmke.cz/pictures/files/dozoxal.pdfIn PDF document text
    • http://tcihk.com/userfiles/nagixugoriwuwenufoz.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/86676079278.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4047490564.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/84503179798.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/45963516008.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/novilutavifekepe.pdfIn PDF document text
    • http://moristas.com/userfiles/files/26606028182.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d69bed27---dukidelegopidoxodolujorok.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/guzixonimorimofejebukosaw.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/90086409136.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/jujedomuju.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_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 17896 bytes
SHA-256: fa5817b6609d39ed26e8fa2c0d045a5ec9d9720b99b7ab0444601ccee14c285e
font_02_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 10596 bytes
SHA-256: 211d41f39b8a1e2e65bc74cb54fb59529ae61fe9b1adf768da588b0a066feee2