Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0daeb6c67de9e82…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 14:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ed8e66380cb0ef5985ef06635dec7c8f SHA-1: 65e38e5eb8f09419e8993a128b5695c1af399641 SHA-256: b0daeb6c67de9e82c15b29613851ec1bdd8a2c8a4430a1276264a37215fb6dfd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=hello+kitty+themes+apk+free+download PDF link annotation
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b889e87b185889469f7e8b7850a11ef7/33361765221.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/dolefesazefolagolo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1849ccfe137be2c050e138c744be42d0/48195803390.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/buzadavema.pdfIn PDF document text
    • http://com123.vn/uploads/file/93390990046.pdfIn PDF document text
    • https://izometal.net/mm/file/92458845098.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/75483609155.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/zirazexovabu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/c53a3keddpe6dhitjejm1j6epg/tavobamojugabuvepebupomib.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/73048861297.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/92851981172.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/vekikuxo.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905164244.pdfIn PDF document text
    • http://elpijisystem.com/file/xelaxam.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/98464192093.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/58857432113.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16142283a194f9---malipake.pdfPDF link annotation
    • https://thietbixanh.net/uploads/files/14267118927.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a8fbfd8959156c2765c12e74ca2c2fb2/dotuwetudofazosetugeju.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/rupowokejetizo.pdfIn PDF document text
    • https://orrizon.ru/images/file/kogajuwuselagatixugidese.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109140203286956.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/vojegizomona.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e8d0691f---93009311846.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/siguvasatilufofa.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_off0000bee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 15756 bytes
SHA-256: 4104c2a52a6598cdf4a68e4db5e1c7ee85bfd0c97c462d896d98953969df1879
font_01_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 11048 bytes
SHA-256: 577040f2982f28e20a6975d9f0a3eef824fd02b64ea5225ac9418a49859384ab
font_02_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1