Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25df6b2961d679a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 05:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5101c563542e9f1c9e12f14ea342b193 SHA-1: 7ffcf72fdedee8c2b466216844d4b159b2c1026d SHA-256: a25df6b2961d679ad6e819de0d499b3de8c69bd721e5710c52602b1acf049e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a deceptive document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://modnyi-buket.ru/uploads/files/maserowowaxolilojoromap.pdf In PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/ketedinezuzenabokutej.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ecf05df59c7fe79d5dc43960c650e64b/bapakepawes.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/nikenina.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c9c670f77ee3b52135ab604a966e741e/83876137609.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/jexoxatodulinesazus.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/566d13e6b197c23b73508e61990a7271/28949949949.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b91611096cdd3e24ea1d8eb70082b48a/mizevawonenibibimofekuv.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16070858804ac2---97615642303.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/ximiwesetumoreboniva.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/41678208639.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/89100858860.pdfIn PDF document text
    • http://519pf.com/userfiles/files/roderomig.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/65392525874.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kizujipuz.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210815082819.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/150594fc580bb124f29282d38b22559a/62911484468.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c13a0f47---3175499445.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n7s6ejhqfgjitkk7m01ighslni/zokuwobo.pdfIn PDF document text
    • https://x-software.cz/data/file/goganotepuxumi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1509b8272614c26db11bd8b9562be7cb/xudipapujodedabokizewow.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210719_043051.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/safefilisowutuvesokagofe.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/vikebuzubijebure.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc162bb444---61905725589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tom+ferry+business+plan+2019+pdfPDF 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://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_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 16564 bytes
SHA-256: 47099aa9afa3edb9759de49183a06e1f2dd41224c45edf146a4082e3488a39d6
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 11340 bytes
SHA-256: e25bfed0b966ae3f3f13f13bc12cbda02fd05f4e4071a71b6d5d90113dadd933
font_02_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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