Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec96d8471b3fb5b9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 05:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d8fcc736a7c407996639f446104c89c SHA-1: e065655bf6691c2cdb95f63f698c22747c2ed907 SHA-256: ec96d8471b3fb5b9fcd03b643014bfb604c6b0b64eda991232bb39e7e99dba1e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=cuphead+all+secret+coins PDF link annotation
    • https://guijek.com/userfiles/file/39580755002.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/masurinagetenuzanul.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ee1a2cebbd031f2e0abd367331ac31b9/61522504045.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2f92ba25bcc2c94a4b50a360a38a61cc/41676077001.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/rezuve.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61bcb4f42---14858131598.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kisiluzafuroz.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ed9d13974---25183840198.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/18a5d3d3ebc7502f59b101873f26790c/rojobeloz.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/bexijubevibugateduwovoji.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e793b99d5d---72596915396.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/be10cb4dc5058147a8883011d97be3ea/89767166388.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vovko6u9vh9qtrvmq77urdtl9o/ranazapibep.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/19975057341.pdfIn PDF document text
    • https://mondialardesia.it/file/84368955035.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-19/20210619133539460530.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ce4a61be---89086077355.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/wibuwirosolag.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609def0e6dab6---mebuzobafafivusiveka.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/lubupeluvirupafawe.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/022637d408c55f63c69272e4437a20b0/zunotegiluret.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2777b82f---38672916636.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dda58c0c---93251781192.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2557460d683208e23d15f7b6240027f4/joguguzelasepusi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0689160739---wagutodugerimale.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/91963532980.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/3cde440f623875ed77435fb95e711df0/60337577233.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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 10740 bytes
SHA-256: 5356b94a70888ab707996c9850572d20340998f36f09622dc7a887d4a779b58b
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16996 bytes
SHA-256: c277bf6479960fb5260ad918dc8cd6aa414b8c8ee88af430a56f624e6a555153

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