Malicious PDF — malware analysis report

Static analysis result for SHA-256 44864c6006d1cbb9…

MALICIOUS

PDF

107.5 KB Created: 2021-06-11 07:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b316871e5392e46023eb6d0b1ff101f7 SHA-1: a65145bc98b5eaaf80cb4f8a007f30e784e1968d SHA-256: 44864c6006d1cbb9ff151a0976453f03f38fd1ae26511d331f668bd66ba14222
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9996

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://krisoc.ru/uplcv?utm_term=ultraman+fighting+evolution+3+iso PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b35308a0a---11719028607.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/nafupisopizudu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b4276213ce7370c03f14440a34dfdfea/9004875830.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5db7686f22d5b51b375ae8aeb3c3d735/18566693983.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b59b63dee---wibukifela.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d40826ecf4df549a9ae35a591478a384/gukowozelunodogi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160813fbd6518d---46230260116.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6de547e7df42866e2575a67c84ec763d/40235047607.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089c09aaa1c2---32572284981.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b65677ddc8b---88858035853.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1af6e22e52cbc71012671233d87b466f/fefofuwunul.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g34g1m9f3memkkvgm0cst7nr4v/46735201191.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gec55u3q1kdbtukmcn9br1sii4/71270982856.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/s2jbfk9d3b5ildpb57je5aj5aq/tigedixew.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085925239e83---refezevezad.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f710a35a---degezibede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E73 4824 bytes
SHA-256: d9290bbaf276bb9f850732ad3c6287609371522d947822a6c5c476ffb4f53026
font_01_sfnt_off00014fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA5 5396 bytes
SHA-256: 2f885532be310ef3ce7be5911bc057af2df895990c6179fb441553636005f253
font_02_sfnt_off000161e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E4 11568 bytes
SHA-256: 352e57be6b0d0910689687631e22f09d46b6153afaab1ce0a7ba5f364f30d2e1
font_03_sfnt_off0001898f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1898F 16132 bytes
SHA-256: 29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146

Open this report in the interactive analyzer, or submit your own file for analysis.