Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0a487665bce501…

MALICIOUS

PDF

98.0 KB Created: 2021-09-04 13:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a11d43cff69b0c3da640ce03fe7e7dc6 SHA-1: 96a30b851a7d070879e10de5fb558f080d5e68e3 SHA-256: cf0a487665bce50126c0e746af38dc73bce49e41e82619e662592fa0df94495d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The primary function appears to be directing users to these compromised sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d4345f99e1ea51dacc01a8c3089c0f41/89707287003.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb274e7d5a---xuwomupavijoxezaroguwav.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05757909fb---bezaluwebadarezut.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kogamuv.pdfIn PDF document text
    • http://rjt1.org/upload/files/69655697182.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4009bd764f01c5cc052871cd7c42f76b/99586810368.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/zudomipubametewur.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/71571443014.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/91045277048.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/kofera.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e7261cd2f258f6555b52d83548101695/disufisilidif.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081ccd0461f7---58583927403.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/92209440588.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6fcaa57f6---4707403543.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/vsj8qr8iqabvp51jo5703duu42/32903205815.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/15798603352.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/feraj.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/katafitodis.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074bab6b688e---xomumagalorululejugirijof.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/87799834319.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/sklv25dmr5vm0co48isah3ii2r/pujur.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/071523401040.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/2181117116.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c65f84daf---lakuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=prestressed+beams+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_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 17928 bytes
SHA-256: 9ab4131b38c385382c14902276f6cc154de92540e564587fb2e46f4748a324b1
font_01_sfnt_off00014b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1E 10436 bytes
SHA-256: 2bd29486712bcd60b893eb7ef6f0b0278aad53ba62ccf0206494879fa4f38cc7
font_02_sfnt_off000162a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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