Malicious PDF — malware analysis report

Static analysis result for SHA-256 219ab75489314e1b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 04:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3eb9de8f22a82256a57677919a651222 SHA-1: e02e93fee813d245a3280fa27c9554a85cadd99d SHA-256: 219ab75489314e1b5ba6d8d30a6be2df986bc9c5f39086ed578b719bb0a4146a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution are consistent with phishing or malware distribution campaigns.

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 https://crysiq.ru/uplcv?utm_term=vehicle+body+damage+inspection+form+pdf PDF link annotation
    • http://didula.ru/img/file/89668032431.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b91857266ec---nitowulojokorunojiwat.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7ecvgq93g35ucmhimao0len450/mirekaxir.pdfIn PDF document text
    • https://visualarchive.bg/files/kinonotiledaliw.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dc2gaktnfcm0sqem4v61eqliq3/nexabujenija.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080fcc18d450---19337288889.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/5743981604.pdfIn PDF document text
    • http://envigest.cz/upload/file/29528767807.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/gimozenazijefamelubilurok.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d25dadce3---xarurasiladoluzovafatalo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ff7495c72f2370265ae587ae325b2afc/piwarukugofuxowoxo.pdfIn PDF document text
    • http://matras-devison.com/upload/file/88747102856.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/punesasafakenijijas.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7121c62cf07d9757b903fa97dfaf0f01/24395604956.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad62edc4df---zalugusixekomawitiv.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244af00266---dufuwukuxawulapexe.pdfIn PDF document text
    • https://hiroyoung.com/data/files/gubivusajakavilixagefujum.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca4171d8b---mimaro.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/15424755435.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071b52c56163---zizuwelaketodosis.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/givoxisukusukirewas.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/74052511995.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/84471712792.pdfIn PDF document text
    • 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_off0000c8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AE 17220 bytes
SHA-256: 8c76a683721cb4ace3a3117964bd94ae13bec5707a2f061145f57d4b1435a6cb
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 11288 bytes
SHA-256: 45626a3c35392c41d9f06a82991cf0ca33fbf57300b7b1acf523ca7e177df231
font_02_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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