Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6de8a237c49c21…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 03:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 392bcd45c666c03d275b6586c1ffce6f SHA-1: 44a7b1be857d68a8fedc91e67db5d40bcb335613 SHA-256: 2c6de8a237c49c21c4a806b8dfc3dfd3e416aa4e6e3cf2e1b9bbef57ae822670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to lure users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://baongochoa.com/upload/file/kajesoduxeluw.pdf In PDF document text
    • http://christmaslandint.com/userfiles/49868846540.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/85050889113.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/70562306580.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/34630690559.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f57ce331f---97464274457.pdfIn PDF document text
    • http://vinmexindia.com/uploads/52504804743.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/68279468294.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109111853221124.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/26596747180.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/21486699518.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910043850420020.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/donakiduzupipaxefer.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zagixizab.pdfIn PDF document text
    • https://telorgabus.com/contents/files/kakadunamitarojovep.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7e23ec88---munugalodavodezun.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/lufuziropebawojijoz.pdfIn PDF document text
    • https://kueapem.com/contents/files/lotumoziladiwukixulaxo.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/38151553185.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe3c8c3d1---88711571285.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4419b1a2---wuxuxobikosulitur.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/24436232678.pdfIn PDF document text
    • http://agro-partner.com/Image/files/14721491000.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/9639690177.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/xepufofixosene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=7+letter+word+starting+with+duPDF 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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 17204 bytes
SHA-256: fe32512b8e7bcc8ad9430685d1d61fc33f4bdc29e5e6fcc09ba11ee383eb2cbe
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 10664 bytes
SHA-256: eca1e45cfc4e0bf189a4efb85368623e1488e435cc9c39ae6db043cd1bebb1e0

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