Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd6ca3338d9c85d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 23:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9db2665d672c7cd7bbfd2e81cda6fe5a SHA-1: d95339e2b5b6274b8b96ab1105235328c5321f55 SHA-256: 6cd6ca3338d9c85d62f6ed2ff638a19936ea1f114defca23e662cd460a4c45ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the presence of multiple external links suggests an attempt to redirect the user to malicious content or phishing pages, aligning with T1566.001 (Spearphishing Attachment) as a likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://shindah.com/images/ckeditor_img/files/82970748952.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161376b150b7f7---genatokumuj.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/jerisigisovemowimufuwe.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/22352057539.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/24708883571.pdfIn PDF document text
    • https://majubesar.com/contents/files/keraxixewoxokur.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/fotevowewosuparagi.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/70886523103.pdfIn PDF document text
    • http://24cvety.ru/upload/files/55582194773.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/47635472082.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613379937dd83---xobanowopawekumozawi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/97832685360.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/37669068098.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/44375704680.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb19318a7---tuvuxupununusapumuka.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/62217897303.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/57138453587.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131720018875---wisasajamani.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2d13a209---lovad.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/segosarewotewiw.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e468a285---wedolaniwazilopexometinig.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/82097503392.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/72090582205.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/59058228302.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/13188871208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=david+harvey+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_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 18380 bytes
SHA-256: 56c46bf088799b6a6dcd3071321df32e9f307346d944991c60c0abef495fe0af
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10240 bytes
SHA-256: 030d28afc5c6c774e7908a0d63ec80daee3004d9878f777a6ab543aa6a2f78b3

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