Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d09ad7485b28ad…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 12:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee38d2f9301afe26e56bcf57d5cc267b SHA-1: fd995f637b1ab70c64c594ad5505d5acca77a3e5 SHA-256: e4d09ad7485b28ada80fd18a2fbd223ebae43659298975068e62965083169db4
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tinavaron.com/ckfinder/userfiles/files/54104195623.pdf In PDF document text
    • http://hoangduy.vn/vn/files/46248306600.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/25525755058.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/dekukubiwarowojup.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd4d1f428---37401140562.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/nawakifebonu.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/34439433816.pdfIn PDF document text
    • http://vning.net/filespath/files/20210922222935.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/59094977621.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/38014519254.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/smfiavi5na442gi7ifj5qbv0ut/xutolepeniripifetavuzuma.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/1078792660.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136817b73087---bogasadakidogugi.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/lurukan.pdfIn PDF document text
    • http://freeski.hu/freeski/file/69120583126.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/85314094752.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/jefezanatelokixukibes.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5edc5a3c0c90f563354f4c19279a44d9/72992171930.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/96775006569.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/f54dc655f2dd6ce9b438425e797358fc/16578250822.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/72047942407.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/rerukuxadivigugemokofofib.pdfIn PDF document text
    • http://techmechengineers.com/uploads/79366954370.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/wedazagofiziputalida.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/zogoxiwupuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+x+ndsPDF 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_off0000b8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 17880 bytes
SHA-256: ced01ed3ed91ff944ea202aac802c08f0b7ebbdae4df0367f48af366ce83399e
font_01_sfnt_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 10104 bytes
SHA-256: 2244f6ecffb3a5c7e2801b105896eb8f6df82dc5ce9b61ab7d0a0628d95d8231
font_02_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1