Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8cd4e6b3fea0a2…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 04:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3f0504227c7b00980ea01fac8d12b38a SHA-1: bbe990960ae655a654ab496964321b731bc6ad5a SHA-256: 3d8cd4e6b3fea0a2ee6714a5ec21ff42ffa15b898a348014c69bed87c1e99854
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF file was detected as malicious by ClamAV and exhibits social engineering tactics. It instructs the user to disable security software and execute a command, a common precursor to downloading and running a second-stage payload. The embedded URLs likely serve as staging points for this payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc33069f8---konimanosot.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/43282fdd2fd70d34083546ff7ff4673b/pewajudofivafubula.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021060319455373499.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607704e216fe9---dufinalakitopenum.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/96462530724.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/mijeredezutasemewan.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bbedf9a79a48d82f7e73a0af67605ac0/80104519879.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f283225a69---ligakumex.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e3977574---15337228205.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78ea508bfa---39488196321.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/nasanepanekudimugejap.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfec6c00f---torofisojuta.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aa3acb28310e3dac60cb67d9a6bcb459/72283382395.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a7c161e9ffdba7b38b107172a95f3477/radidifowakasevusapek.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/66246231898.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/75135944921.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/gaxuliduvivububajafo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f60d25c87---49998216851.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9ffe6g7i58kea9vdtb059gaco3/tamagelesexom.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2a2277cc1---25002127683.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nolufen.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///24264982198.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/menomu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9f9c8d4e23daeb2c59e3767392e8166a/xujerufejusasijatodiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=problem+ejecting+usb+attached+scsi+mass+storage+devicePDF 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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 18032 bytes
SHA-256: 4b3249399fcacd0ac41a3b91d0857be69c8e98c83ab62212654d9ea4c83c37cd
font_01_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 11252 bytes
SHA-256: dce92518a1ac7c773383bb81c11d7b6d9a9820d3f4614f43cbdc4eed4fad7dc4

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