Malicious PDF — malware analysis report

Static analysis result for SHA-256 598297f9847472d9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-07 14:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2b87a93ee877b9a478001f232f34622 SHA-1: d1cf375376c86fef7079202ffc6e82f6e9309687 SHA-256: 598297f9847472d9697ba355a5d4963b22e0d04879370ed2c345bfda602aab5e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure due to its image-only nature and embedded action trigger. It functions as a link farm, directing users to various external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.pro9apps.com/app/webroot/files/uploadimagesfile/19704081322.pdf In PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vosadubod.pdfIn PDF document text
    • http://greenbrier101.com/userimages/lurog.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/dagararemipilezadif.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/mufewigisirifutumi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/n593j9cuhkodpbkt3058liaof2/55534393812.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/nonipateduladogedoj.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/kevidufafimexexemo.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/gulavisuzafuwajol.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/16fb88d21aa42062ffebd60ebd9002bf/mekefomonamaviloke.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/gofumazitarezutatesuma.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/34064537811.pdfIn PDF document text
    • http://deltools.com/userfiles/file/90377515000.pdfIn PDF document text
    • http://bakoca.hu/files/file/bitusiwawesasaw.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/92337166599.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611038a498d66---71212989724.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/93033889507.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4165c79e3b---bomuroxumifogaf.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607c157ae93a6---rusijiwalalibopusunonaj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b4cbc76f2179e202d4fac5a05b49527/97062837283.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4kfh6irbqp9b2ac4g8kt33ncpi/94730685030.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/77509565803.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/26241118339.pdfIn PDF document text
    • https://superchills.com/userfiles/file/41785450358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=9th+class+biology+book+pdf+free+downloadPDF 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_off0000b459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB459 11404 bytes
SHA-256: 720870e0be22a876d6049b44c61a809912ce81382b7fcf265ea7a4b2c8cd12df
font_01_sfnt_off0000cee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE6 13984 bytes
SHA-256: baf911de67856765fbf479112300579bc11bf187216c3b026230f50e0151b4a6
font_02_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1