Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5c022cb6dbdd38…

MALICIOUS

PDF

106.9 KB Created: 2021-06-18 01:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b52b0e1fff16545b2453301fde91027d SHA-1: 675df2dae9692407cc7206a7fff6ad998e2f5ec0 SHA-256: ef5c022cb6dbdd38364bd90e4f00b14b558430d4e9c7f51e32dfff92957a5e7a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure, likely intended to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=golden+seed+explorers+of+sky PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3979fdf25317b078f9f13ccf28d1b769/13961418189.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0ad7158d---mojizalijamas.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6fde7d3b6---bagiwobinidux.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c6f01889278d129ff3893cbd025b4997/divuparipefakurotigularav.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160925bb0cb8ee---kugunirasewigiwi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bb98e08dd5775bf8a65fb5e5ab0e3505/sujaboserejotakojufixuse.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4385efdf---57211541498.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/24267347298.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d86dc5291---miwababix.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210616103446.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/65391164798.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/95051244535.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511a58a43c---jogipasidiwat.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/63722322217.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97c2555ae---vijirosuzanorobezuxeko.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/60379603594.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_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 24272 bytes
SHA-256: 026814c670ee61c1da3fe878683a139f0c93a6ff2f64e48ff8c9355af636b830
font_01_sfnt_off0001528c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528C 5088 bytes
SHA-256: 8772ea1c12e26b5a1b93914858e31e3d9095fca6ae72cfceb27785605458e3e1
font_02_sfnt_off000163fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FE 11568 bytes
SHA-256: ff1b6e954f138ec244907fd599b2ba51a7ec4df901fc0759d3e29bf7b465f7a4
font_03_sfnt_off0001895b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1895B 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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