Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c57c15602556b9d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8da0e1772cb78be4472e848f1cd3311e SHA-1: 4d6d3e92c3aa4dd08e885283a5db57d1d1675b66 SHA-256: 1c57c15602556b9d5e7aacfaf34a3de09034fcc364086e387f1008577a1f1e90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=pokemon+red+rom+file PDF link annotation
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/35479903686.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/dojosalomedez.pdfIn PDF document text
    • https://redac.ch/upload/wemagukajovuwenazolog.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/lonipimot.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/gebovipuwuve.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/15337877572.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/22775076616.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/10791679388.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6ae3abd0---kosujafegotinozovekego.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/43715050271.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/47068573955.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/96054462917.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359e8b75879---wubapabafusutis.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/95682070077.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/xiwuxitun.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/34262301140.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/36a91ca10df2ad0d3c7d7d9125b4bf36/gezafeserutowosozevi.pdfIn PDF document text
    • https://basisnomor.com/contents/files/jolosinovo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdfb054d6---xowobajelitanaboludunij.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/mepikisixedogifodudino.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/devafifajarozofij.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/78137639241.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/51528124910.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/13553345053.pdfIn PDF document text
    • http://mylodge-naoshima.com/52973380779.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/30660849232.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_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 10180 bytes
SHA-256: d8f17ef5f45d2f036678ba2d62d7b93e85eb8423d63a6c69ed14833f0bf0717a
font_01_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 19308 bytes
SHA-256: a71fc540d6d1a294101c228df77cd6feb97cc44cabc839419be31248279f9c78
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1