Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d7d4953b501d20…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 11:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6504bf287b184bf0fb766f0a96d1a220 SHA-1: 5c5a75432636c7b283b9728ea3807730fc9a8222 SHA-256: 23d7d4953b501d201ac59947e25dfb3b685c4dcec8a6aadd83c7b8d1a8fe0b5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dianthusindustrial.com/resimler/files/46952744028.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161312f65af29f---lugowaliwabunulaw.pdfIn PDF document text
    • http://candientushinko.com/images/file/84370614138.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/zidesasubudu.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/78087375810.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/66386501033.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/61983704946.pdfIn PDF document text
    • https://ijp2.com/contents/files/23258153366.pdfIn PDF document text
    • http://a899.net/userfiles/file/11271488955.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/34518811513.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giweva.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/5842071711.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2fr3iaumagf6ee7mq2smnq0j94/bituvufuradexirufiginur.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/jedipiludivadonedupeba.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/zipuzelin.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/rawiri.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/fuwobujiz.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/44376425419.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/dagalemonijazure.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/29556004409.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/15442380610.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef95abae06---fexepagunilikivugemasa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3aba18d1---vidabukilotokiziwijuxe.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/82632249097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=nfc+support+meansPDF 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 17892 bytes
SHA-256: 3ceb546b1ae7ed16418e179d47e0f894d8ae0d17e1e17289c922e9de03898d31
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 10580 bytes
SHA-256: f3e83735cb03ca20eedd88ef645c893a113522878383c75376e918e2bed36b77

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