Malicious PDF — malware analysis report

Static analysis result for SHA-256 64451b9629b1a2d2…

MALICIOUS

PDF

73.7 KB Created: 2021-06-15 20:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67a0679ff8d1f2b21dbb63b8f65e1e08 SHA-1: 03b167d1ccf0157cf5b4bd4500dc605a6311ae4b SHA-256: 64451b9629b1a2d2bcf067aa3b6d9aa37133ecadb253c10d8df8c506079a1733
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Moving to banford city ielts answers', suggesting a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=moving+to+banford+city+ielts+answers
    • http://banghetretruc.com/media/ftp/file/25716524600.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7cc0811e3be317c81febffe7711f6e80/82731003720.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/4ficsn5vagrr64kths4ks0du9j/39204281664.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pksha1e8cgar5uidjscn66ijr0/pazagulojixi.pdf
    • http://dok-vo.ru/userfiles/file/42331310760.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f5278c6c---70665446541.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608942c4468af---69249938015.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1e48ce9a---poxeremetufoposo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd1d3e1f6---10120238585.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/nqrcnamd483m4catq172alooto/xobamesegutada.pdf
    • http://goldenpeak.it/userfiles/files/17417692136.pdf
    • https://angelsstaff.com/uploads/file/xowokazolakidefa.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081318a5b39d---41294363887.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d700fe38b3---vejupupegitarusozisotinob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db40.bin
91f809ec2536fe78de03a212a81447c96c4acc24cf2c6cce0c38915f60127170		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 5588 bytes
font_01_sfnt_off0000ee7f.bin
185b910ba3c5d48aa95016ed7aa3b91c04c3dfda735dc8518bc33d3c64888621		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 14040 bytes

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