Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c7d3669c223cee…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 02:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c193727c79cfecd3ad59d398b36aaa83 SHA-1: 92d093a1e50e75512e0ff733ac7590397df67482 SHA-256: 95c7d3669c223cee74b63ee5aea38386772237e3571b0cd16ebb5b7818dbfdd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=communion+bell+hooks+pdf PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef55459872---renar.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/fc5285.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091603232676.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/5128020498.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/arpj2p2ktc7fcb03p91pb1pv95/99468280559.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/18456370351.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/87123159179.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/kufupajuraba.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/woledowerowetonuve.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1fae8a34---kavudibilenutu.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/11869025153.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fazipigoditigikitilosoz.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/10089086689.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/61893321159.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/61198488434.pdfIn PDF document text
    • http://babamoleskine.com/files/file/18789820123.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74438073079.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/42923093299.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210913_233141.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/muzuwubobeminabiwogozixe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351e8a2de87---32150145397.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/diwomigewakenine.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109022015065929.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2ab922d5b76dd7f38a65aa65125a08d/kefonemodi.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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 10764 bytes
SHA-256: 7a0dadb372fd5ca875d3e903ddccccbe6e5dcb2dd862ef78b932b7cbfa24488f
font_01_sfnt_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 15252 bytes
SHA-256: 8a3ad5667e1e93accb7e875ae0d65e021e2d25987835ca948a88187e983ee259