Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd5dab54c75699c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 05:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e61483c273a06c8e90fed0bf2596109a SHA-1: ca3d898a7cdc5855a0b31a835388601ff29ad18d SHA-256: cbd5dab54c75699c98b07cd39ddf41130d8277e7e6c1cdff1f4bb307ca32da19
156 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 heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to lure users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=how+to+multiply+decimals+fast PDF link annotation
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/11ca961cb006b6c2f20119f4d247f93a/nunedale.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/7495020317.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898117c3a8d---41026274615.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbba988e61---wiriniviganuzebu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/061649555222.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e00dd55e---tixalosudivodusanivuvap.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/totusijiraboluvirobiw.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/f3c3fd659c7707d3806b02f59c95760b/13440071789.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/roxup.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103f2a1bdb52---11761765674.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/87077101923.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/42205610644.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609185398a229---redugutonemuze.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/63076593734.pdfIn PDF document text
    • https://sfilatinogourmet.it/file/68247939573.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bf3b74129d24607cd4c36fbe1edc6c07/10961795989.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/lodozuxomupapusozogimubog.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/499d044ca685f50aa8e3c6d535379359/dinaj.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/87928363697.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c92d260c---75995750706.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eceac0ae43---xejemoxodoze.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/69862538268.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/moroxorexemija.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/bakemokagexukufamipumorer.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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10868 bytes
SHA-256: 4f32f4fc34bf83086652d686a6d7bc495fe5f8545910b8012b42522d88d38f99
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 17136 bytes
SHA-256: f5fc70274a3cd3a43d284dd2d6c09b6bf106bbc37d7eea7fc28da1f052e304d3

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