Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a6fe3687e2179c…

MALICIOUS

PDF

75.4 KB Created: 2021-05-16 12:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a11059065d96908de468454002456b8f SHA-1: f2538e277bcf1df45c59d5f82013dee745e5c303 SHA-256: 20a6fe3687e2179cdfec3e0d0dcdcb0063ae7f661c3d7588f2a203ec986277bd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to untrusted sites.

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 http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607816acbefd8---rimebomozowu.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/04f070e58873cef5dc5c0e9808866c69/34053667265.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/24496903892.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/cb7c4413da19fc63510d74be8faf44b2/jusaw.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cdeac0155b678788d42023e7f6800650/16872653864.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/24af15e221eeea76b51518769e0486e4/torujunamaxu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160906acc185e2---54653914382.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608077401729a---97065944980.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/67508339503.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/98674549252.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a031179b029---ditojokife.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/5159549996.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/pndltikkteki1gaf99t0v0e4ar/nepajulo.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1fphsf4i3cp7mqfpesb4e552af/doseli.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d27a9c3b---bexusujafagukotuviri.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/252152839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bandos+solo+guide+osrs+2018PDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 5564 bytes
SHA-256: 2328e97fff091701f537d7920a1ada10228b630a2689f24ae40cd4206c15b4ac
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10752 bytes
SHA-256: 851d4e6dee2e66092d298e7e1f4283d654b148304f83e8f7da7dfdbbfa1f7f5d