Malicious PDF — malware analysis report

Static analysis result for SHA-256 465a15dce7ac976b…

MALICIOUS

PDF

83.7 KB Created: 2021-06-10 22:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a373f66465d929a27f03348aadd3336d SHA-1: 7ebbc43e78c08671dc5197c14eda20afcc45094e SHA-256: 465a15dce7ac976b83fae4270ad4114321ba9773b41b8f6a372998183292d6b2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the PDF's structure suggest it's designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=cast+of+avpm PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6cda6268---67378986214.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zuwigelixadexajikenokas.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d42adf71---jibixuwuwinoki.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jnepn1hga2e8uh87vh4a551ldr/26009168758.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/salisuzifonuxukepax.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/92038419159.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca2f8e459---23651287883.pdfIn PDF document text
    • http://landpas.pl/upload/file/20864165127.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/27308104737.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bffde766353---xefopoxuda.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/94111040602.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/guxup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 4516 bytes
SHA-256: 8561ecd265c116928f1ccd8c9cf5993b0ebf9783279559aafdd88c11c5b34b20
font_01_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 11440 bytes
SHA-256: 29becf2e547e36f2bc3c9cfd4ec4d11f78e337f217c5a0c2b609595b78bda355
font_02_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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