Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddef3fd5564cbc9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 00:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26d7a06f1dc1fec86b31f469b9771033 SHA-1: deb0c3fed50d80a536b3b19f3752675ae55ee016 SHA-256: 5ddef3fd5564cbc9fb447e21a7413c3c2b991cff73911ae76e3a6477f211d69c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farm indicators strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://dolphinkorea.com/files/files/97856606983.pdf In PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89389455597.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/23751613765.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/923dee98ca69fcf324e9b9ae992c3bab/venumejufabuvirum.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/46293510529.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/koziburu.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/pevimomokonowoxubugutef.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/28792927668.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/41027808226.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/58911148498.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/zaxiroxaruposujem.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136568ac1b29---37987710598.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a772fe1c14---56411326254.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kovorobilisebikuwime.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/vuruporanabu.pdfIn PDF document text
    • http://bluebossa.pl/files/file/sorafu.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/73606370602.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/sowusugaxubira.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/11600077254.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/56936745982.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/mebojafiborovuvevivoras.pdfIn PDF document text
    • http://fxlcd.com/upload/file/mezoroso.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/db39d145b87bae0f22427bf7db6ac2e8/furawazeledesirafuvo.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/15841279565.pdfIn PDF document text
    • https://777mto.info/contents/files/radenujero.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/romevifudakubipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=omegle+best+alternativesPDF 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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10560 bytes
SHA-256: 6ed2336306b2716ba8854cc57518f43f07ac211fe8b7db547b760095bedb9acc
font_02_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 16812 bytes
SHA-256: 6edc8f835c236b824dac7894de9024c5589d68a46623795e0ac1db40c9974007

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