Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b9a8fe14fea093…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 15:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95a6944aeb4393c24c7302e601862839 SHA-1: cbc9c2a15bf9cfdd81267b055601e63f1578a297 SHA-256: d0b9a8fe14fea0930e3690848e5b999a1f50bef60fe0d1da397f18199643adcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=review+wl+10.1+tablet PDF link annotation
    • http://alpha-cp.com/userfiles/file/gapulotevatadidije.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/78351585138.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/77435776986.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/39480511591.pdfIn PDF document text
    • http://apicn.net/upload/files/80665501388.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/58158535377.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320bfe29a7e---97357353193.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/58941896622.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307bb038d32---3956008971.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/37304973483.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210911_F9B86EF3A3803214.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c9a5827b1---39378650462.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/46849598790.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f603093554d27ea31524164a8cbb85bf/30253532014.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/45401930909.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/kitusemera.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a4d601c2fdc156fa999534f79956c6e9/84539026353.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/mudofal.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/22741452649.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/29267394458.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/68839042209.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/lejem.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/80152997598.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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 22932 bytes
SHA-256: 25cd6b9cefd1dfea7148a3816689dd8101c0e57843d6daf92447d5a58c81d8ac
font_01_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 10188 bytes
SHA-256: 61803cc7b7dab17f69e543f0cdf0007761f8fdca435ca5c1e29d6b9048dcb8d8
font_02_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1