Malicious PDF — malware analysis report

Static analysis result for SHA-256 96099f225fe4a6a5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 10:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f55b4c4f2085adfaa65afef44f5d06ca SHA-1: c6ba0f0d46eb679e0c440285d49077beaa411eb9 SHA-256: 96099f225fe4a6a5fb138c1d71d1819f2e61ada861cb54582539c4675820f070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised or disposable domains. Heuristics indicate this is a link farm designed to obscure the true malicious destination. ClamAV and ML classifiers confirm the malicious nature, with the ML model outputting a high probability of maliciousness. The presence of external URIs and link farms suggests an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mwflower.com/upimagesfile///fumazumuvobof.pdf In PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/83127739001.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/39903268628.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/dujenemok.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/79452597165.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8ff3f3b683eedfd3d3f65dbcb8a4264f/bipobizosogifivazazilixog.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/xarusekotabukumew.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/zaveg.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/gezaxuj.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/pizob.pdfIn PDF document text
    • https://blokhol.com/upload/files/48092067769.pdfIn PDF document text
    • http://contua.org/userfiles/file/57518202657.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/40240549286.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210907_2ED8BC5DE99ACA2E.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/47516868270.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/finoruvafaseriwajad.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613634f544f35---togobotikizokibuvelabobum.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5e425542829a6af7e806e9d519a6c350/45406758281.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/zizidotuzepadorimapabiz.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/38228375374.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zojupoxumemojesebiwamexat.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133d31c75936---tebowudefopotoz.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/78911505596.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/fotofarip.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210907033400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=train+to+busan+putlockerPDF 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_off0000c484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 10660 bytes
SHA-256: c91bae6f2c2f942073489e79a6fe8cd11ba9d55386a4a85aaf82730c4eb21a79
font_01_sfnt_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 18312 bytes
SHA-256: c74787010d151e6d3cf1b1e24f97ecfb8be181143c798e4b181dff50dc16ba7e

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