Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcb4ea563f1e898…

MALICIOUS

PDF

76.5 KB Created: 2021-07-19 23:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b3ca52f14e10f5d3ae29f00dd5b444d8 SHA-1: 1ba8472e47c036f24665db59d0a32142149d71d3 SHA-256: ffcb4ea563f1e898f8d7e3835b6ee1b9e6eb462295a0b8217a3e80c253591b86
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f3c69a167---zugugukatep.pdf In PDF document text
    • http://heyumpnd.com/userfiles/file///48952766548.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3dc83b9ad---80757625176.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/zapiwoxi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3fe9f3e683a9f25a98ab45889cd4dd7/wiroxazabefajujuxevi.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/08f190f733dc2497ff01c0b65fb8bac1/delagexedigorivamow.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/b1bkp1usi5tu26nkur9ai5hd8r/kuxiforodefo.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/79f7cdaa9e17ef8dffa5601e6c70c23e/kusirifotix.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/rejafigiworiwewifot.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/r0fcli7v45ro4d6pb7kqmldk81/gozejamekozebufijeg.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/62238683361.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc9261944---79410866786.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7895647b---lufapaduwo.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/letasaxototet.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ed78cbd6---gawumevozimadigajinezor.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e2719524913db5a650aeae29a5204a51/90137925249.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/danoluxikigozof.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8hlp3hud6ncg7va3a5qcli1vs4/pofusuxuw.pdfIn PDF document text
    • https://soechi.id/userfiles/file/xutopudiko.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/49145976630.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b555e5cadd8---pabomisemefon.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b1a334a33d12a31fb48648494867026c/27883552926.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/dd6da6de0846abad4eabd6276a26f095/kosusamavujirogunimilid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+build+inverter+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_off0000ca51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 10544 bytes
SHA-256: f3084de9649d15429fd8eac5876d1d77adba2ba1d45b3468bc13cf52705e0280
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 16608 bytes
SHA-256: 22e0560433c133a6c24cf55b29b35d33a6845ac9ef48e95ac02c23812eb6fc35
font_02_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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