Malicious PDF — malware analysis report

Static analysis result for SHA-256 9568ea4911198d6b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 21:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e21f08cd7de372bf88d09106e1cf6fde SHA-1: b66c3c518c605ff9138986ea79c6a40d5b0045b7 SHA-256: 9568ea4911198d6b75dde6e72d16d3f7203b82a37409d242b102766edb840e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=fundamentos+de+la+publicidad+pdf PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r7jrt4ggrqislp376jfji8pcfo/watapifapaziba.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16137463e8534d---21228437878.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/95752461322.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/vefobidasiwowixusutoxesod.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/kanedokefanimeme.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/xerosuvuzovabit.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/86018373677.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/12114530824.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/dibopivaxerujevirado.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/losezuwigizu.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/lunegim.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/99256808017.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/wutozujumetexef.pdfIn PDF document text
    • http://headrepublic.pl/images/files/naxurusagef.pdfIn PDF document text
    • https://europartner2.pl/uploads/10889793092.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/lezapove.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/70535521028.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/41122323743.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131206a97f61---25923268184.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/wirelewuwiwulinedaxom.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f733a19d44---semisisibuzolobuz.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/88198332676.pdfIn PDF document text
    • http://trubaopt.ru/content/file/lezudobatonexuwifolanavo.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/36278770031.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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 19340 bytes
SHA-256: 7dee2943b76ee9aba284aaf96e7fa304c83ad0d1c73112f77df3058783941650
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10900 bytes
SHA-256: d0fc0dd4b7a156d7d247793ff9642800b9153e7b3a3af9309bc825807f62ad5c
font_02_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1