Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6f21f96b144ec2…

MALICIOUS

PDF

79.8 KB Created: 2021-06-18 22:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7029fa76c347e51a4181162ecfd6a699 SHA-1: f26be07f9213597e3c5e3629f8a8556dcc64f01a SHA-256: 8c6f21f96b144ec223b36df0a920cfda5d2a77f77a89fec5ae71ed55696cbb03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://anukulagrotech.com/userfiles/file/mixodoneregekolegujezabas.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/24764449997.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/muxukemimelubibavikux.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830c71114ee---10330583910.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e3ab2d58---6193588639.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/6261279265.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/dedexogun.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/98380720469.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7e054bc9e43ef83ae31d2a24103a741e/lenilosamoxipowazaratav.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f528bcde3e---27833963337.pdfIn PDF document text
    • http://aimic.com/userfiles/file/40587051521.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16099e86a85428---supigur.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2034f48973---bipoxaka.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796c835a9f2---fukububewunugarijo.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/ninevagumige.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
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=impossible+quiz+book+chapter+2PDF link annotation
    • 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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 5396 bytes
SHA-256: 0df4088ef5de02217c91070b41414524d4f547e627f60a6f77385f5db932981b
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 12464 bytes
SHA-256: 4be0b41bf0339523d35cfac4e54101aa8a13d4a4aae0a7815025d3dac88c97bc
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34