Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c94cf55c682b5cf…

MALICIOUS

PDF

75.4 KB Created: 2021-06-14 23:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7aa53c9b233feff7d4071b5348080833 SHA-1: 6f7f030a293d8edc223cd9729646672316c7de63 SHA-256: 2c94cf55c682b5cf6be13a0863fedf79cc9fbe77097ac413ff8d3c57d646bb69
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body text, though heavily obfuscated, appears to be a lure related to downloading music, which is a common tactic for distributing malware. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=jhene+aiko+ft+brandy+ascension+mp3+download PDF link annotation
    • https://bursakaynak.com/userfiles/file/linuxunixadofafunejerep.pdfIn PDF document text
    • http://whatdwellswithin.com/file/ralerun.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbbfb4154---wowakebepotepar.pdfIn PDF document text
    • https://tavio.ru/files/file/44970050414.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fetojemav.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/sug9go8ubqn68a62i1srktvn40/mafawijikuwokoxowaso.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/e6ak88gpjtk2r4gqsltsvj0172/98441544236.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/56038871756.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081e67b1a000---90187258677.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/88151268104.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xepatum.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/2779ad94fd0c14f5b46cc54b00bc2eaf/29331669716.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef44dbf1c---41710696452.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/22132234718.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonajufikeziwetaki.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/97733213520.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fed1868de---fufonakuwegoditinaziv.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 5944 bytes
SHA-256: 26df8b5b24033bc0e20d025d50fdaec2083977adce71ddfd653e9385af04e4d0
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 13864 bytes
SHA-256: b3b94c8d670c49251711872776e7a6a3b626f465cd30e1686049efa753ad011b

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