Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d211a3f7fa3ab7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 01:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 729ced8281943aa2f2fea63b5feec43c SHA-1: 831f73d694c48a521b95680cf35eabaa77bdc64b SHA-256: 15d211a3f7fa3ab7be6239195482fdd6a710c8fc93ec72843b524b7261a5d6a4
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with several heuristics indicating a compromised CMS upload and disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://booknowrentalimo.ch/userfiles/files/wezexonozivopipez.pdf In PDF document text
    • https://onecre.com/images/content/files/32922514125.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wubafekamupok.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/srou93p519aauicjipm3h33ung/wezadut.pdfIn PDF document text
    • http://markone-tools.com/upload/files/17717057245.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/luwikajefazakemegejil.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/jomowovefofo.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/mitozubijona.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903154834.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/81261898499.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/60875075005.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/5799185291.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zudubininowenozu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e0d08c80e5ed35bedfe4ef32c7af9978/6303968512.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/69444295371.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/51882624603.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/16893929468.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/fivusexofutapubilizuje.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/gubipezotifuj.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/pepazujadabivugado.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/wavazumetidezebuz.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/medusovafotikag.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/33080430302.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/10981395378.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1e37c557---maledinakomexuseloloja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=crash+bandicoot+3PDF 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_off0000b014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 10632 bytes
SHA-256: c3c63c2e3ba1fc3097db0b9901e85c068e0e2e2c66b927bfb02ec8021b03885d
font_01_sfnt_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 15632 bytes
SHA-256: cb95c04178b81f95892612afe6edf489c6bd2f2017a4ec8d63212be887d83923
font_02_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1