Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e0e7019f454c8e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 21:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8dd58b642a8f0eeb69dde5e2e43e389 SHA-1: 0e123bafb3408730bd816007e60ab982ef732979 SHA-256: e4e0e7019f454c8eafba8356cf32fc6d46d020b0991a5bde89f515db33ad3470
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=neon+video+maker+premium+apk PDF link annotation
    • http://galaxyjewel.cn/uploadfile/files/24980482.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/kofowesaxeji.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/jarobuw.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/borapesebanutomewazados.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/20776681603.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/golusajom.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/67876818571.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/niwufarakevokaxosopuvik.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/wufigijenemibupero.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/31508396803.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/33168746191.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/57192551955.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/12771312009.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/16812792048.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/420b4f9c2876dc223fb69438ae5a8293/kasawilo.pdfIn PDF document text
    • https://terracell.info/images/file/6054769479.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/bexisi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d45ec84305e99cbf572abdff61a3b08b/muxerukedijuware.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/simiximoxumi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561d0dc2af---66715556973.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/39423277746.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161364f3ed858d---67168069553.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/7164996423.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/kinifus.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/72939765903.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_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 10476 bytes
SHA-256: 3019c16573a925c9449f489cd3a5c251d22671f674aafdbb88f169cfab3e050a
font_01_sfnt_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 16300 bytes
SHA-256: 3956fbd613a857260cc4cd55d0ed5cc5569412ec01f8688ef63db83830dc9aa6
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1