Malicious PDF — malware analysis report

Static analysis result for SHA-256 142438c7135eba22…

MALICIOUS

PDF

85.4 KB Created: 2021-07-19 05:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aaf5e8cbcfd4c30741f2ebc14b2fb967 SHA-1: 1b233e9cc06a0bd1fe06510f99ffdaffe1f92e7e SHA-256: 142438c7135eba2278c36fd1c2bbf645153f01615bc7bfd6ec97892fc360661e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://argentinaproduct.com/ckfinder/userfiles/files/42038304378.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/323888c92394ece2f77a0f7fa089ddd4/tirewobufepitux.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/68234071698.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/71479409806.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/19550501951.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/loxelekamobebozum.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b419133df7f85eed5183f754267f3ab3/wetodix.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210716_F6DB2DD28F42F47F.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/051107132155.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/66964523015.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f039dc6133477f0201670edb7456d537/87055474048.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607200f19b6dc---rujagobajofuriniririsub.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/sutapedigoko.pdfIn PDF document text
    • http://wych123.com/upload/files/64339661168.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/2d81fca22fb17f97ccb1fcd944c25e17/vomibo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fixupefij.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607886adeb5e7---foxakuzozatejizafupave.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/indmitss8he0fedr5bp77d9fm4/fejubexuxexanedujipagavis.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/gufajidazilosaja.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084946c4f3d0---bugiw.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/noxeguzosatataxorek.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/29953614969.pdfIn PDF document text
    • http://midel.me/userfiles/file/38907986080.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c8ca716a1d53a7ecdc25a3508a562c47/32142973720.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6154c708---sepidotipekuz.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/29791753684.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91b87f81b---56837345614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=takes+precedence+over+pointsPDF 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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 18396 bytes
SHA-256: 80f7eb29dec080aa68b66166489ce844f70c3f66b3af55cb08254c3d656b39fa
font_01_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 10584 bytes
SHA-256: 3cc9f29c1f99bdd402706772a61dbff76aab55c9b07de187e7ddc1ddf09ebd6a
font_02_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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