Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2298ec332698453…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 20:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39f16af3c3059b5a3e6d02687dbed571 SHA-1: 253f14d8f714974621bb22c4bc6e54dec322bf43 SHA-256: c2298ec332698453077137224a1018b5998e8d59955dde5e99c51622b304323e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hp-cnc.de/uploads/files/mitetefeno.pdf In PDF document text
    • http://mtkshop.com/images/uploads/file/55462721496.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/85267897557.pdfIn PDF document text
    • http://klenderbio.com/upload/files/73802970548.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0vdmn6g4m04a517nahq9jo9n0q/mekafo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c85f03c2708fca617e12dadee95ffe20/pizililukewodivox.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/63828770376.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c07b9dee---topenadu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e53134cf---dunaturebibavof.pdfIn PDF document text
    • https://dm288.com/slicice/file/16516412265.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/mozulafumolamozunipu.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/rawivasibetemogavufugigi.pdfIn PDF document text
    • http://juncheng.tw/upload/files/tutop.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/xixew.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/mulazivesoxufipenuxezafa.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/rilis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=asphalt+online+gamePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/7110557514.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_off0000ba89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA89 16120 bytes
SHA-256: 4b64b00ecbee7480cee4f1262293f621c111cf6e1b6195102e62e01fd252b1d0
font_01_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 10580 bytes
SHA-256: ca17c201b767993a2cfd81ef3052e6b9a434b4d4a26ccae90e3b3f4d59501237
font_02_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1