Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d7eee02aada98…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 16:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99e9fe2bb898151287e4b02475e219db SHA-1: b58ac9e6bfd460b1bd2b0d51726877182908240a SHA-256: 4a8d7eee02aada981feea6dd7a38197a7dc1d3475100486a17b59cb9c767590d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a 'download' button heuristic further supports the idea that the document is designed to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=web+page+to+pdf+converter+free+download PDF link annotation
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zefik.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d83a5bf88---semenuvomatubokejo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e77a1f2047ff14a0b1b99d7e4612c81e/xutadomosinilafagusononi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a00dab399d---13715565697.pdfIn PDF document text
    • http://learningkey.org/userfiles/nanoxavuxukupumitozakopa.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/41417839680.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/6399821999.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/75922358434.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/35d3fe3dc6ac525668d4c2f09c6c6035/tedoduxas.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/73245949839.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/6d748191088d66db6d83581b8328f98e/56227819666.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/xofukupagizo.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/3282032285.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/18137689604.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/melepekobumejepo.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/96487255819.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/61722069947.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/43431105295.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e9d33a45802c010797ffa6feca623397/dewipelazovoxafeguxal.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72714182e---zixojelawetuvuturalu.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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 17192 bytes
SHA-256: 24553c9d65952d5de6499e9c75849ecb6af442351df44ad26c0e50807b435736
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 10820 bytes
SHA-256: 539d31f6e56d3d426981e4335f713576e2675e31674d27494cca6cea334d0428

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