Malicious PDF — malware analysis report

Static analysis result for SHA-256 f518f0312b3c248f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-24 20:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b53fd890c597026748cb5810b46a826f SHA-1: 66ee18a008c8f4aba2f7dccf26e48c07a9d97119 SHA-256: f518f0312b3c248f5b0900aabd13619cecdcf3ad218a6ce857cfdeb27580b436
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The presence of a URL with 'utm_term=rollercoaster+tycoon+4+mod+apk+unlimited+money' suggests a lure for potentially unwanted software or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://chcial.ru/uplcv?utm_term=rollercoaster+tycoon+4+mod+apk+unlimited+money PDF link annotation
    • http://spc1991.com/ckfinder/userfiles/files/85135495564.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/113561752.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq5rvb5oklvu6l5v42kjb2cis2/lavivim.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/piwiwogokiwo.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/49214269669.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/65717609674.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/wizodofutekozolul.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/57603749752.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/zusuwetiboduwesufa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lejabewa.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/jaritapulovuv.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d15ee0894f1e7d08588ae796ed84bdd1/82939718321.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/70467313747.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25022366327.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149138f080dc---37553066676.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/81295906411.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/43339988307.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bosawututavizabogibo.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/loroforuvefafagugix.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/worefavode.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/vofarowatigaju.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/88222002919.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/73462924866.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/95704100579.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8a4abc0255cdae0de7e57837be01fe36/fuvofegowubiloretigobo.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/juluxenumogubim.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_off0000b5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C9 11104 bytes
SHA-256: 5d07edd76478068bdbc3c1f5c9d89c725e65ab498d49b78dc0745da197dbe7fe
font_01_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 18576 bytes
SHA-256: 55ff0e8317bba262d9fafe9ad86e9fcf580e53e5f85badaf0160d08579f53a3e
font_02_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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