Malicious PDF — malware analysis report

Static analysis result for SHA-256 4409f09caf3810b8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 12:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: decfdf464e81b744558f9b0557876d02 SHA-1: ccce390d17dbbc064149523d7d260ad834b5e8ef SHA-256: 4409f09caf3810b8603a84f01f54d4a249dffb1f61b9ef618ebe4eb49960c59b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external resources, many of which are hosted on compromised CMS upload storage, suggesting a link farm or redirection strategy. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://chcial.ru/uplcv?utm_term=vidmate+app+original+2021
    • https://elger.cz/fckphotos/file/6257103693.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cf75a92e32d48f0359cd7d6cfa8327a4/83067227760.pdf
    • http://langeline.com/ckeditor/upload/files/pemagegugejojive.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/xovinokukipaposamewew.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0adf780345721a6bf598985290518a23/69027426363.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613380ae328aa---31014112967.pdf
    • https://mimpidia.com/contents/files/fevanezivupek.pdf
    • https://hotnews.md/upload/userfiles/files/76072279320.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/wesuvurisejepoluximino.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/84951263677.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/zudarisigituduke.pdf
    • http://leaguengn.com/userfiles/file///xozix.pdf
    • http://sungwoo-n.com/userfiles/file/77844300411.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/51848212660.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161472c934d909---gaxosenezi.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/beb8c372a4558d2e9b9aac0bfdefdccb/43825107536.pdf
    • http://ongxoanhdpe.vn/upload/files/maduwusapuxixi.pdf
    • http://orikon.net/Images_upload/files/pomewetogijafaw.pdf
    • https://tp-pos.com/uploads/image/files/71507231496.pdf
    • http://delve-cr.com/uploads/jajupasugexapafinijatasob.pdf
    • http://www.jfac.kr/ckfinder/userfiles/files/95049777965.pdf
    • http://turnwealthy.com/ckfinder/userfiles/files/53779423991.pdf
    • http://dyglas.com/userData/board/file/33248379432.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/5ba7d3dce104d09e6f93957f3092a7d1/zedafipoxipa.pdf
    • http://sozopolihills.com/userfiles/file/gobawaji.pdf
    • http://ombs.ru/uploads/files/parop.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/zusowe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4d1.bin
537e725b417dc2e051452b39e62d16706b2658a0b28d4f9c8ff7cbb28c351568
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 15232 bytes
font_01_sfnt_off0000dbcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 16792 bytes
font_02_sfnt_off0000f3e2.bin
5d2246fff5ee8331c2b095529faa18cabf6da864f8c3f9ec72c74eb25b7cab4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10832 bytes