Malicious PDF — malware analysis report

Static analysis result for SHA-256 09baa3d63d790915…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 02:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d25770ca960a24b217eb24ecd87caac7 SHA-1: 80bbdce4943eeb7ef437d7c2cb0de28d617b98e6 SHA-256: 09baa3d63d79091583249f2bff4e38ba2b2ee254824d03507b3992cd36e23450
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://palazzodiaz.com/userfiles/files/57852510857.pdf In PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/85562273416.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/89407284143.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/84541355928.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/wudukevozezeraf.pdfIn PDF document text
    • http://52963566.com/upload/file/202109082104046607.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/91443646982.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/talikiruvilenavalod.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/kavitov.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/rezevimeritekazi.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/71941357623.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/80698452195.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acec02ca29---velasopajebalexiwozukeri.pdfIn PDF document text
    • http://hk-keber.de/images/file/66464163446.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/wafavisene.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/91331184918.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/1815075279.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48e7d3957---7987530581.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e9d5100d---14026860942.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/20853818014.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/vunigarola.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/12650617307.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/20896612173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+data+extractionPDF 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_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 10232 bytes
SHA-256: 898ffb60e959711bca1ea3c36ff0281ac8ea8562992f094af9473bed001f65bd
font_01_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 17504 bytes
SHA-256: 29913039315befed5a04bd52040e1f5f327f8f72867932116c1e23536ea2e02e