Malicious PDF — malware analysis report

Static analysis result for SHA-256 980c86b8b1523662…

MALICIOUS

PDF

85.7 KB Created: 2021-07-08 00:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c6cf6c79dc4e80f09ab6547dd1ed2ff0 SHA-1: 4d846bd95b2f0d32bc3a43f4a8f30d3f2b2e0333 SHA-256: 980c86b8b1523662796fe526016d781a16fc2830a2d2e6adcdc797a21e961ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of link farms on potentially compromised infrastructure suggests an attempt to obscure the true destination or leverage existing vulnerabilities for distribution, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b3a7e63f5---tiparuwatebezuju.pdf In PDF document text
    • http://cookbox.nl/app/webroot/files/userfiles/files/dixamadimudekibupeni.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/69f20dd8aced3e2f8f6aac06c48a8ba0/40110922284.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/79293606307.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/wubasobe.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972b101ca4d---62771384756.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/72954111912.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c107429e745---51721640845.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/nibebidulawesowub.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rfb1ummf87re5no97oimpt36rs/42000160789.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/23971804727.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/221935249396.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624385433.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/mamin.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d814881fe7---xenusoniduzimuzi.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/junatakadoterowerifojupi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cba130f5d---11781291994.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/4880384611.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/747636568c5ce35f6a4fbc86cea1de00/mufatelozojonixipunewez.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/be352cb3f9059706f0e95fd7de239fb9/kavisimaxo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b917660a---61752027242.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8u88km8km6ktm57vt3qood0n7k/59977233252.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/67167751770.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/44809412936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=empire+of+storms+full+book+onlinePDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10672 bytes
SHA-256: 4140f4385c1f698969df7f5d5f2d865e2c886a5c3ca0916e89a297f90ae48e40
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 17412 bytes
SHA-256: 0dd02cb61a2db0c392e0033acb9d5d85048759ec34177d64547c39319b0c77fc
font_02_sfnt_off00013185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1