Malicious PDF — malware analysis report

Static analysis result for SHA-256 7978984b7c6ba2f7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 17:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d63f5a2d1d9552d650f463b79abef2e SHA-1: 1e276b57f688a1ac66bfcd747030ba3072834d4e SHA-256: 7978984b7c6ba2f7ffd60fab05655f04c5dec7444f0696455e8e45d0c63eef0d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing malicious content or conducting phishing attacks. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, increasing the likelihood of malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7162

Heuristics 5

  • 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
  • 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://studiodebiaggi.eu/userfiles/files/xutodolezavu.pdf In PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/ruvafinefel.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3dbd55e3---taromadigilipivawoka.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1c5e23e9---lujeje.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec9f09f7ef---72922092837.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/34604020024.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160897536479e2---15085806090.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/eadaebdefcbacd27b4a7f99ec8bf187b/92216489806.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/zujizoramiwu.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/18944298116.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/jadufobewudex.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/82946753564.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/buxek.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210528115632100.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/21851315682.pdfIn PDF document text
    • http://learningkey.org/userfiles/dulizusisigokinu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/845f9362593af6cf17f55b52216fdb37/widekalaje.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a36c34a2f---88178791595.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u8ie957p74iqc2gqj7b5gg19h7/jurinuvu.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/rimitovoxedev.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/7407259798.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/salivu.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/navegazafinenudezew.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2b6d6ba85015df1c0da3e2e074ccafbe/12191698472.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb1a685861---18125210805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=traductor+chino+espa%C3%B1ol+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 22280 bytes
SHA-256: f6a1644b90134ebebf7b1da7ea61e299e7cbd2e5f0b6674fe56e7c32743afddc