Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c299780bc2d099…

MALICIOUS

PDF

85.2 KB Created: 2021-08-17 02:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25db68e1ac52202281a3b93d6b4eb0c2 SHA-1: 029a462c12b075571bad433b0c69e4077590382e SHA-256: c6c299780bc2d099ccf50279803de9b33c83eae26f533b8c0a620f55b536a23a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nomylo.ru/uplcv?utm_term=how+to+get+free+parks+in+touchgrind+skate+2 PDF link annotation
    • http://augustaelectricalwork.com/editorData/file/foxefawitotelixuroz.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83029aba6---69210224190.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bkm0jq7a601e9b36if3ra9m9b4/bazegidupoxe.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/nm5b3r2ich5d46aicoepkahqbd/69758621467.pdfIn PDF document text
    • http://naucseto.cz/storage/vepalarifukobozokaf.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a18ec5a139807c822a486ede90d97ee4/8904981458.pdfIn PDF document text
    • http://614move.com/clients/4890/File/fopilodevu.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/59187702073.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/70gggjgk41bc2189kb498tukf5/39253435121.pdfIn PDF document text
    • https://elektrona.cz/files/file/37759293330.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021072720512752.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/29535128439.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/2786490899.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/mebeza.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e6f28a919a3f75338895545f116f5eed/51726820985.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/50092b53707f2bbce22bfa1cbc695797/kutopivuvon.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/zivam.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de33e35dd---jogezasaru.pdfIn PDF document text
    • http://rjt1.org/upload/files/lomawemizinusux.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba5f9f352---dibemiwukesulabol.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/9301127772.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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16872 bytes
SHA-256: 364c0f0da7cb8fc65687a451a1c4f4c88e0a24b59082d970fddc8b39b957aa43
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 11240 bytes
SHA-256: b3a3274791dd6c1181245a0a96fb2142660320a8f1830b12812a25cf46a97c85
font_02_sfnt_off00012c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1