Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb5b8cbcd052dc2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 03:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59147eddafa0a390985e1e6a3de49a09 SHA-1: 6ee96aaf10f5117d1a51cbe858134bcc2530bc61 SHA-256: dfb5b8cbcd052dc26bde3304c23e2e4d23dc7069ee0c90537e68ed354ef1764c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and link farms, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=where+can+i+watch+the+impossible PDF link annotation
    • https://ijtm.in/userfiles/file/bitopebagijulum.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420b9c02ac3.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d744aba955bfbee8ab7a3b50f8151725/ragowetufurakedox.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/tuninegajurowesujalew.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/51486680047.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/sevavevix.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/95783808584.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/40204904857.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/3400006018.pdfIn PDF document text
    • http://devveb.net/userfiles/file/nazoxamimanezuwisig.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/95604655380.pdfIn PDF document text
    • http://insei.eu/userfiles/files/tizowunifosoxagetukuxu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ba749835---63483770292.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/vakexadisenikosanabaluwu.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xegopenujomuliwosalif.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/2410143590.pdfIn PDF document text
    • http://djapm.com/userfiles/file/55616016504.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/23907868586.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/80959223624.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/tibiwogivulovubokoje.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 18300 bytes
SHA-256: 4d9d57c949ffe16e61912a61afd6813e0c1632050474262d9b4dd0bc4ccca8b4
font_01_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 10860 bytes
SHA-256: 8283492cf159dda26cdc1d0e8f8ce151cf8ef8ca853c8019a6fbd275f0e61ece
font_02_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1