Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d01dde1d0697585…

MALICIOUS

PDF

87.5 KB Created: 2021-08-07 14:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5d4bd3f6674d884ba09e996c4255793c SHA-1: 870886cc15f3241e9e30cd945e3922c3d2bc95cf SHA-256: 1d01dde1d0697585f56690814ed44b3c31d2e05bba5b9a339a7190b67f3dee0f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f1d04lp9l5b0dfjd5afbph2s1/85506489190.pdf In PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/3nrrdos3i5edkihc6s78q5l7n4/zivimisanixepoxejolugofux.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eebe90b5d---pasubatevigupetatowozon.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/ledir.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qbdjd2nohamihmpo1j8ontqg9g/gomavigexexawes.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/78209183941.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c620f438c26---tunanatirotugu.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/rimalebux.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/84434793269.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620dc0549e---98228738405.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d88d40320---74341671504.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/feretadidufikusefalumiv.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/27917605064.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9af620a18c294eec36cda239472a3fb8/44481137403.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/muxujepodajez.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/e9186aece0fe8b6dd484138921aa0f66/daxiruzabefezikomikaxed.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gofodixojupexitel.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/18397771243.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/lapifisilusepuwudurijuk.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/57108053853.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/56021496867.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/63419452428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=expressing+certainty+and+uncertainty+worksheet+pdfPDF 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_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 11332 bytes
SHA-256: d0d895f9e40c791c59b8babf838921e9b41abff0fc85c09b8df1fe82bd67a1e3
font_01_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247E 16552 bytes
SHA-256: 2cf8fbde9a2f4c04bb344e911eaea59fd53e4d53f4d8598266700d8cf0242f1e

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