Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55a8adf84790b5f…

MALICIOUS

PDF

73.1 KB Created: 2021-10-04 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9c467dd9a7046f6835c76926cc14517b SHA-1: b21eaa95811da4d73072677350f36ba6964d1d60 SHA-256: c55a8adf84790b5fbbf6e215d99daa97e701fd1a6521c3b4506e884db8fcb37b
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, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=is+eating+fish+bad+for+the+environment PDF link annotation
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/50f93a16d2ea6ba141a95e5aebdd721a/86907309741.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/rejetorofuvipov.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161432e598880b---woforur.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478b436360c---fakuxofivatud.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/fefosedetuwutolabikulali.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/tivuzodubezofaroda.pdfIn PDF document text
    • https://akemi.ro/hirek/file/kurolezujox.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/zexuzapobarekegusuxagomaf.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20211003084541.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/disasibiposegu.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/18440279759.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/kalitalivig.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/kiwusasafefiwujuretasifo.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/suvorugetuguvawaw.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/kumasogikonevuzetoxenuruv.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/nukolasarizonum.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/8607155966.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/vamelisefede.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/suzug.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/77240764446.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/fefabukuwinodulidiwiti.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/64055724472.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/61386847320.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/kuvesanirowulewisix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efea671488---tubagifepobevovej.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_off0000bca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 10912 bytes
SHA-256: d86bfba57b56a10d922d850f29544f064eaefddc5b7de757ac4b397e856911cb
font_02_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16068 bytes
SHA-256: 4457d20bfee331affa1f3b09575e58ce6dbf6b0f0e75c0d18d867264570bd560

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