Malicious PDF — malware analysis report

Static analysis result for SHA-256 be79417de60f2e01…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 10:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baae665260b37e92f93acaeb4b86fbf9 SHA-1: 5ce5cf174d8d78e389a61c27428614274af1c86c SHA-256: be79417de60f2e01362669fd7af2d731245479e86eae9438397a939f47ed6050
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a campaign to distribute or host malicious content through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee537d7a1---zivininokesidi.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/25249463375.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dde6332b2---zumefaguribep.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/panadaku.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/masaregubedidiba.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/53783692837.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a483fad8d55---noromuleruzubenovevak.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/xelububuxafit.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607215d902413---dudivojobelebesisul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805a9958399---32933043934.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0621b6c3---51654065108.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tv3m9m950pvdej6aii67lh16av/33573761076.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5bhbhsnitgq8roj0p9ao0mn111/vijuxotarusozo.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/gexexojobobusega.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/32886739339.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2ff5ec7d26f71fcc08b3682c12827c0c/bopituvafanedotewuwidaf.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16086e759746cf---fugifajivare.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf5f044d6b---29483223159.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/wixorip.pdfIn PDF document text
    • http://www.bash.cl/media/file/72713542944.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/slonrj79e31nk1aibes7nfrch3/75605289614.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/nokujenabagezavipinubur.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/39908870445.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/52ac58c4dff2b96329f48b68a185de1f/pakutotezejupopogejodebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=collect+pdf+into+onePDF 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_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 10212 bytes
SHA-256: 4bf0b4860fd8dc55160024f2323f4e459496892fefc20a177f981dd909ee212f
font_02_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 18492 bytes
SHA-256: 5dd82ed8c73fed48a00fcc7ad8ead89cdd873f9b694cbc5432a92035cae79670

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