Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9511558642ad7c…

MALICIOUS

PDF

91.2 KB Created: 2021-08-11 01:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d27a2702cb09ed450fa11cc37ec33882 SHA-1: 305aea935a45b08987ceecf556afb6a88bac8a7f SHA-256: ee9511558642ad7c2a9f3a45f21e689583eb128fdf0aa508cf6d069706ae6f9c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm nature of the PDF is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=figuras+de+linguagem+exerc%C3%ADcios+resolvidos+pdf PDF link annotation
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e359e3a78---57162185144.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/xaloninupo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f057572802b---pobubuxewixugezig.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210530103222.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d57bca354---77092068010.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/dupenavavukiwawibixekoje.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608069af37f4a---sijixu.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/wonaximimekik.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vifesiguvunadexeduted.pdfIn PDF document text
    • http://sivam.pl/files/file/dokesivamuvofuvo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086554a379aa---59526681548.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/63340462919.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/56625176837.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/83065588211.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59acf9d38a---fepukaliwemijosutufis.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/dawegejimekozizu.pdfIn PDF document text
    • https://tonitomov.com/picture/file/suxize.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a10cef89---97495845099.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3c68f5b3---4036895414.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/6827676988.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-5/20210605085455305919.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/50bcbd6fe100f59dbae85403f3a8bcb0/47522036420.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/zoxazozowetonopape.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/12367100704.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44f85ced6---xijaxetodotupe.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/dipofarojifoxatapegesuvil.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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 21152 bytes
SHA-256: 6af9d0650060d406afae999cda648cc91168c641b2e8a98f7b85b16ecfa1521a
font_02_sfnt_off00014218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14218 11172 bytes
SHA-256: dbbb7f72119bc0dd56ef407da5ed664644e07c3165315d8dcf3dd8665a717eaf