Malicious PDF — malware analysis report

Static analysis result for SHA-256 4247e5f45469e556…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 05:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10785f0f475cfa60a22a7b2a85f5ebff SHA-1: 13c7b11d92994f330a7443c8549f481ab21f46b9 SHA-256: 4247e5f45469e55619defed77ffeb4a531e648c22f417cf85d46a85f1227cee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=the+house+with+a+clock+in+its+walls+full+movie PDF link annotation
    • http://goodtraefarm.com/ckupload/files/mujatuzotozezosixate.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/zoweveginu.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210909170744179383ausb5.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd5804916---dedugexuwov.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/51587595637.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/jekujupumafotuzepem.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3e17652e37ba070d8e127a86c36ed244/80810499830.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/topezorowaxezefolupoj.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147c79f12b34---gakefubovativurob.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ripozela.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/23513412886.pdfIn PDF document text
    • https://vpmemorial.net/images/file/magurisat.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/67274708469.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/xaketa.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/rigowelumavinaribopobine.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/49705112735.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/vojaduto.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/jufezuserurasunebur.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/kebuwevijobodubesesenazor.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d410d5f150---puwinemojenatugonubawepu.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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 10808 bytes
SHA-256: b1fca77775177ee31dcfec64d947b04b67db1e7718226cfa5c5467643e235e46
font_01_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 17516 bytes
SHA-256: 8c5edd44b4e710c8697c9d5d824b0c5d796678ccf337c50c46406ed6fa7810f4
font_02_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1