Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8a66cf004dff40…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 02:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5ee721db313c71e34aa4f4e8ec53eca0 SHA-1: 8c0951b556842c40212f68fedef9c34cb4feedfe SHA-256: cc8a66cf004dff40cf3ae127cebed3caf2f22ce89f6981fe63cc6285e10877b2
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting it's designed to deliver a second-stage payload. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request to trick the user into clicking the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15238fc90---wotavaxet.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077895dc7e21---70387816134.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/zowanuxifogawodu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d037f2ff1b---pomefalodadufafufidof.pdfIn PDF document text
    • http://fedoro.ru/upload/file/42027760375.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wumeparopamuzasit.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3999d1427---96540596517.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c7fef11b---37307249765.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3c235582208bfd45e4498fb9b347f9c8/vafaki.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b76360656e6e36491d7c3eb81b59c537/fetijopogidu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8400d9d88e4bee2ebb73adcd2fd8d408/nikikalezo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/89e215eaec941e18d99c6469cc8ba066/tawikesisosali.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/17244808309.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/dabomusoxanawolezuxume.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160927eb1e9357---83022112892.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/womosanubuvodivaju.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6b5d0d47bc4991db808e7d5c686ca941/60122413297.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/bonadazobadefo.pdfIn PDF document text
    • http://ippon.lv/uploads/File/bemepafaxatazaj.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a09a0426---kuxitapububugi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607996c569d1f---xejuvo.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/nutusudegorofabe.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bisemuzevepijijogi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hj2a93s0s8ndt4qcveq7a6h247/zopikupiragif.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216101123236287.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/22193497128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sale+agreement+format+for+plot+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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 16624 bytes
SHA-256: 7885465da78f7479e02eaa87e9b6300b96256373bf9f69d2e9d115a981d03a92
font_01_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 10656 bytes
SHA-256: bc55dbda566d38d56869779e6a9226189b77ad96bd3357ffae9d0b216515e9d2
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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