Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56fc89bbf12109d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 13:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 389eedd05a0f22e9c774b6dd35a19172 SHA-1: bc14898f2c00505e83b96ebc2fd78753876e39c6 SHA-256: d56fc89bbf12109d9470e0fb8a4fa871127d28c1dc499a38566c93f8ad07b8bb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wsm.hk/images/files/zeketunosirajafupupetoku.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c696757c30a---kiromusid.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/56692331235.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/27371160345.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/lenidewixonumorumom.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba14bc101---57503343442.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/miwesuxazanuduliv.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160839484ece2e---lojuziv.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f14ee82b9a4d2e1b1777354814d60d08/ludovubezogoxoso.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/tabowefixitunewe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e036e88f42---bikutatuwikibixofimuzin.pdfIn PDF document text
    • http://mobilenmr.com/files/files/16228764143.pdfIn PDF document text
    • http://ubest.ru/images/file/12717291627.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/linukon.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/52454739059.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sifid.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/niruleso.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/41449205932.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/memaladag.pdfIn PDF document text
    • http://iwishop.hu/file/dapiletejumofajaga.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/afd15d838aa15669104e838928e71ef1/javebera.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210720_BB1F9D3134565E2C.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/kudosixototivimidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=online+pdf+extract+pagesPDF 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_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16996 bytes
SHA-256: 22a6a4a5108321f2ce119fd5e8b4858d67ded812e5c431d88cbfc1f451caee58
font_01_sfnt_off0001141c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141C 10800 bytes
SHA-256: e55924b75c1c3f76097697bd3a8ca25e2f68a49d2a82ee7eb5a4c0dfb4324fde
font_02_sfnt_off00012cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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