Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f25c60a7b7d3be…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 20:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 284bc569ae427b8e41a1c15e542942b1 SHA-1: 3c0775c9987e53efc1681f3823e168d2bf6c4d32 SHA-256: 96f25c60a7b7d3be85a68deebaa28f84ff73f7993ebf7fcbbd254082ffba69a3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Multiple heuristics indicate the presence of links to compromised or disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=bossa+nova+guitar+chord+chart+pdf PDF link annotation
    • http://dinskayarealty.ru/media/file/malomegolekinoxenudofimo.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/dodelenizoxesadurusego.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/337246a28d06c189cca60da8e67f82d8/88750685728.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334a117df1e---meragipasamox.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/jazovakebokabu.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/51991498300.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/68916492514.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/38616149229.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c673ff1b---16404820639.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/polutixikatonubokakaser.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/pelawamotaw.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/90868511821.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/xesone.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/73819398548.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/12745329194.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/wusexu.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/39297973554.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/woretuz.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/28725602894.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/89600688896.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/16623544118.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/93116203240.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_off0000b0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 10940 bytes
SHA-256: 2db923990de5d60781a94f82f889da81ae26fe09432e2571e75d6dea510c9c64
font_01_sfnt_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 17396 bytes
SHA-256: a8d58f45f0f4d4c77eb52767e7771a2b3133bc44ec9724dc3c973f3543ee73bc
font_02_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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