Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e8af5f69f8587f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 12:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 625256404f169f2f4fd082901258f5c6 SHA-1: 986fa06ae86084bfd6a90f02d08fd83bb2f17cd1 SHA-256: 70e8af5f69f8587fa23800138c7d2468b5429c9f666ceb53ba13ed2247750d47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://laconchigliacasevacanze.it/userfiles/files/kijugegekob.pdf In PDF document text
    • http://qapoll.com/2015/vat/upload/files/981459307.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/venomodaredefobi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/87439846426.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/88473976277.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/wumiwomunimoli.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97e4c2303---52016405405.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kasejilogu.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/xaxupuwutavidunosegiwale.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/45229251739.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138463409503---xojaxusotuzuso.pdfIn PDF document text
    • http://matras-devison.com/upload/file/30689971337.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/davorusilaj.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a6727ba9ddca00902c4d809f83bf6466/11404621092.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/sumogalatejineni.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135460f833c4---98551691139.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/ferosusawu.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/51002243437.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce5d737644---nifegovomezul.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/16147143662.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/13400879513.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161384f91312e3---35372201830.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/74410101341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nova+launcher+apk+modPDF 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_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 10656 bytes
SHA-256: a1614f8b53052be80059b13d499778212dad5c67ef85f85885c2b6b4266bde46
font_01_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16216 bytes
SHA-256: 5257919095d3b24ef0179fe74e9131448741358e9d87616da483bdcb5796c56b
font_02_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1