Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9c47d786c54e09…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 03:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: aaab157fee7b5e1016c94bda72008e7f SHA-1: 8da8876eb12c11b89220a60fff42c2fc5e828f7a SHA-256: 8c9c47d786c54e091c2e3bd63171af0ae978aae74899bceadcb7253b35a46dde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161320788046b1---momozozilorurub.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/48a50d6b38cc773ce372beedacae4e2c/degafobitajonujipasipiwuf.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/54414667266.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/vujiporofawebesar.pdfIn PDF document text
    • https://losungversorger.com/product/file/sowugotabi.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/kulomus.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/zezozejezopezub.pdfIn PDF document text
    • https://unosms.us/userfiles/file/saloserevekejiwofuwubidew.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///54238779923.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/08/tutepitopepuxiberez.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovawijugamob.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328ab2b10a9---72733680324.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///64685858179.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/3617716565.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/giwofupegufakinivof.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/sarinonoruweririlago.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/xujatisi.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/82141199700.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/69486489742.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/pujakigafidigon.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/vazifarofusar.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/joxesoxipitamegilovize.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/26316822197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=75+level+deathrunPDF 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 17036 bytes
SHA-256: 472e0aaad6ebd0a7de52574569670a0fd0e37f8434349ff7eb97bbf1e8ab49ef
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10220 bytes
SHA-256: 6e13abfdaacfd21ba12c3a3617717b19b1c168b284c200ebae11267c73a318f4
font_02_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1