Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde2c096b4a6a8b7…

MALICIOUS

PDF

79.2 KB Created: 2021-08-27 06:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49aa6eec4cd373c75cbb730e7f09bdb0 SHA-1: 1db1ced858b17febb2f411868c17132f50b649b2 SHA-256: dde2c096b4a6a8b73c4d975b89841e56dff13846f6b48a2a39a56cd3ed1a1ebd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggest an attempt to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the document's function as a link farm designed for SEO manipulation or malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=animal+farm+chapter+7+study+guide PDF link annotation
    • https://gabconstruction.com/ckfinder/userfiles/files/1120423284.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/jobatun.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/anps7fh7786qs1rk6vdu9q18n6/xigofalazowafawozogotes.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9e92ea6a7---20249523165.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/s3trsvpq33bum46l8b4i98m4b3/99616545972.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nodonoba.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gimanizepuf.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/89078709342.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d005203a---nuvivugemofumujom.pdfIn PDF document text
    • https://conrays.ru/f/data/diraxogiriwukajo.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/27268925222.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/12923361827.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/77345915124.pdfIn PDF document text
    • https://loctra.net/userfiles/file/33414188895.pdfIn PDF document text
    • https://daismene.it/file/rixurupilenoxewevoxul.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/72152946478.pdfIn PDF document text
    • https://maisonforville.be/documents/file/xemowepudonubo.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/xarimavojij.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/48060285397.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/wovinodetegusolajezi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/xaxuleneterimixuw.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/polujaxomasum.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/2563281054.pdfIn PDF document text
    • 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_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 11192 bytes
SHA-256: 8cac32ccc905f1fa0cd090f5267b54eb434cae31b1096d077b35d2f57d8c4272
font_01_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 16048 bytes
SHA-256: d30b7929a0798e6833aebf78d77b61d80061f34f7b94d83b63a49b8921a72d60

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