Malicious PDF — malware analysis report

Static analysis result for SHA-256 8775b3ef68bfdf8b…

MALICIOUS

PDF

92.7 KB Created: 2021-09-02 22:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 672a18d37c9fea5e7a5e8f4207ce67be SHA-1: 2457b947037dd1816cb3d421f21ac5918d458b30 SHA-256: 8775b3ef68bfdf8bbe106b034e01702fef62f337c5552bcae71696c14a69d790
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3773ebde22e63ada251ae8913a0e9c70/76863632762.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/37780435504.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/jusesuxakulew.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/97534360632.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/wekoxedukuj.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/87536452359.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tr66kubrce0lmoc8ioptsi80d6/51234846231.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/92608268225.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f2e02b06f1f058b9240c9037dc8a4e46/sinofarerijapexazulox.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/logalafi.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/4529607802.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/94189514801.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/40194674833.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/pakuka.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/64607677058.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f8b2714b58dd5ee84c86319178d8153/85016613448.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0f307d83---81494617535.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/fozataxed.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kaxabiziv.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d974d1528ea---wenatuxalinireroditedip.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607deff8ea370---fepapikopomemid.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/xalenif.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/wumakakorimemodevi.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/23633745796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=acute+coronary+syndrome+guidelines+2017+pdfPDF 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_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 19772 bytes
SHA-256: eed5a881a76622dcb3c0b8b9c9f028871d7b8277474ae3254fb9de46097ca0b5
font_01_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 11504 bytes
SHA-256: ef79704bb483f0ee492d58ba44ddca3dd28e6e10741743894913b167324e3fb0
font_02_sfnt_off00014c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1