Malicious PDF — malware analysis report

Static analysis result for SHA-256 324845485de6304c…

MALICIOUS

PDF

99.3 KB Created: 2021-06-12 21:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b908c4b2d132ebd6799706763690745a SHA-1: dce56851b993ed8519afef6cb8a85385d8636317 SHA-256: 324845485de6304ce6fee9bbc8b6d47c66efa58c5b8f8b53b80257e29b89a95f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links on compromised infrastructure is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://philabc.ru/uplcv?utm_term=osana+simulator+mod+download PDF link annotation
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f29a4b34ecbe3f54a006bbaefaf8eb94/34773438872.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dca200b4d---96970619677.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b594d494d3b---pakapozegulipig.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18cdc1c9e---5066517885.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf52e486edf---87132166090.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0de36f32e---zaretiwazigirofawusetetaf.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d749e1e243---modabi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cd239ae394d47152417ea398e8d9450c/15810891620.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3b561ed4f.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/28684777f388a77c86e28d1fb6cc83c0/7915529632.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/282a7f3e01b11327776c863136317ddd/44274764747.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a1a5171d---1996534880.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/aee59df8f26c730d616ac514759096d8/sivikorixixupixabi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/47187040815.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e10a6870c853f363cffab7a366c4735/43525059994.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31a99cc1c---52828235688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13528 6236 bytes
SHA-256: 8c09bbf1290dd9f93940f6941d4df2683c86e166f8d120fa29db9170b2913559
font_01_sfnt_off00014a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A86 5088 bytes
SHA-256: f9e646c3998b55b0d0e4e7de505275f8d37bdf408108e0f7c386525056b13f20
font_02_sfnt_off00015bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC6 12248 bytes
SHA-256: fc3c6d6caa4c19ccae7bad4f8af9e357219ce6938367d384f2b2319922e955b9