Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ebac98d82565fe…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 18:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23c40a09bcfb66d789370764d9b401f7 SHA-1: 56de6eb48d2c3f4e6920fce31a9e01caea2671cc SHA-256: 23ebac98d82565fee2d60da45545e1aff5a61deebdc4c5e630e1338791318b35
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=state+farm+auto+insurance+policy+pdf PDF link annotation
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/25044151458.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3feb16b83---44806468901.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f25f970ef4---jovevixif.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/1254437045.pdfIn PDF document text
    • http://vlajamo.cz/images/file/68690957734.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/gifavelilesafepidoj.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/dc3ff7fdeeffcceb91a0d7d20adf083d/86944946973.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/duxafasadoxud.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b7kgodovadstd10q1n78ntjvg8/soxokupolerago.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/fopefoguvozoxipubeli.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/8977c73ca5fc7e7628221590465decd0/65452473297.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6eec4c5f---zakopujaxorudalad.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/89513200849.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe41c7ed17---59939506225.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8eqkbhcu0mjahco3fg9g6hufu5/14509510625.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/bogogewejonuwixasepon.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/vukolepirexowaregopin.pdfIn PDF document text
    • http://k1a.ru/images/files/file/94956240291.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1346e327f1---22777587382.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wowozi.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/suzutexilutemaratonawiv.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lazojasazitiwakun.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kn3j19mfb0i4f52ugil2q1rq3e/rabepelebolosidowakopo.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_off0000bcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD2 11068 bytes
SHA-256: 63d3fd64af1fa8b2408fb7ab9f13436cd8210b185e7eec840a4e4df9fb1d140b
font_01_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16264 bytes
SHA-256: 94359f299392ef80c75cfeb659d8b1e56df87c549ecdf6a0c57da9e83bcbe058
font_02_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1