Malicious PDF — malware analysis report

Static analysis result for SHA-256 47163c0a25a8f021…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 07:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8503fa41ff68ea5859b72696a5d9f4db SHA-1: 11f9ca72d4d81aae9f75de40967e4156fab5976c SHA-256: 47163c0a25a8f021a12195d7498c941ee889aba49b3fd4de7827668717443a28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting it's part of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=sreekaram+2021+movie+watch+online PDF link annotation
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/48125059024.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631702732.pdfIn PDF document text
    • https://wildnaturetravel.com/File/suzuralorupibu.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/19640524328.pdfIn PDF document text
    • http://licausi.it/userfiles/files/51514487024.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0e2b1d97---31932810626.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d42652fbcdb8de7e8e22af80342a43bb/51495879223.pdfIn PDF document text
    • http://scpt.it/userfiles/files/37432876519.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/walewu.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/44738345286.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/64703661991.pdfIn PDF document text
    • https://maria-galland.ru/files/file/88651600521.pdfIn PDF document text
    • http://lyshiying.com/d/files/bawenurupevovofufakewe.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b22df05ba---16369266169.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139426a4098a---47347652434.pdfIn PDF document text
    • https://atavio.ru/files/file/pividor.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/latazalemifo.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/47244682958.pdfIn PDF document text
    • https://norservis.cz/files/files/439982672.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/legujurukegibuwibo.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/gaziner.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/17697208881.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/35283995672.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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 10940 bytes
SHA-256: f9eae39e954620f1802a27239a6f478bf2c783325bacb2513fe56c1cfecc6a8a
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 19144 bytes
SHA-256: 3fd1cc6db1b8c60b83bdf4e4a0c3ee205b966ca388fa1086bf46d380ca709f3f
font_02_sfnt_off000137a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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