Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f6caeb9cbbef8b…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 09:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 168615a97f096427b1ba2aece3c8c976 SHA-1: 386f423e8e974e819d5d1f1b882e6ed5e993bef5 SHA-256: b3f6caeb9cbbef8b108587b0770c3d937cc909c8ffc81a40aabd3bf341b7b9ea
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on disposable domains or potentially compromised CMS uploads. This suggests the PDF is intended to lure users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://duancanhotot.com/upload/files/newufotejadot.pdf In PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/16689293205.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/wunitexizitipovivitixemom.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/bojawosoloju.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/33301085701.pdfIn PDF document text
    • https://jetaime-shop.com/files/32031333752.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/rivifobasexabekafozasal.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jabajikavakajulonavovurej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c3495327---43172213189.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/sugiteridenedejasiveve.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9a76b30ecea92d9bc61ccd34bc373a0c/sededa.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/biputusasukedaguwuzuduw.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052311515896.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac2b66950---68347766997.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/wezaponu.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/6004249383.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/wumak.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/jegalumatozusuf.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/ruzimu.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/wojelotuzupigamoketazadub.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/06fdaeca2c8b1d53213f5e49f1c0532f/19808594756.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/saduwanunuwe.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6302431578---tosedozipemepolasigega.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/67092982530.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sensidyne+nephelometer+manualPDF 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_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 10948 bytes
SHA-256: 5ec5aac1e2c47b57d6ba3bbc68d76594595555afe68a4e269d4369b4e863d058
font_01_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 19528 bytes
SHA-256: eeca1549ea8e296cc2c0fad8bafe20939745ed5e44f3e30bb5fb304a471b099c

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