Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0eae50597020cb…

MALICIOUS

PDF

107.8 KB Created: 2021-07-18 15:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4185f9a4f9d3537f41d87af32ed8803 SHA-1: fb15b6a7e481d64ada008f8571c7008183c90852 SHA-256: 4d0eae50597020cb991d33164aac5799e79604988b95d79139c69c948103f928
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://krzeptowski.pl/file/27727812057.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/dkobkdhs008o3nsggv7kdpi6i5/tutivibanepazodefakedudo.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/safupevasaxegedokamobozi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a792eced---jivigufuposena.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16af18b8b---41405936336.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/75378873473.pdfIn PDF document text
    • http://amdind.com/userfiles/file/20045802830.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/95064203649.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1a547d26641f33106931ce401d951b9c/kurikusadativo.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/13939565249.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/234436396fc57d57f567a22b1d007232/66735210427.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906843755f8---50080071491.pdfIn PDF document text
    • http://goref.ru/files/file/lobamuvosexuxukokejoluwez.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c12ea440a---25502469884.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7094e5492341ae126894c8c4abf2caec/33632102093.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/17245666866.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/kutonari.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/wasaguworezufusolifib.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd932da1a7---pozitotumunigujuzad.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d64bb91e0c1---24458432686.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/ruviwigokepuviregedamupur.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/69255209139.pdfIn PDF document text
    • https://afayl.com/userfiles/file/6877940907.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5449db7792---44659527892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+existentialism+in+philosophyPDF 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_off00014382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B99 10740 bytes
SHA-256: c57f94ec78444a537797d454d61edcf75df0e543dfe14e422014bdbdd60c5c33
font_02_sfnt_off00017427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17427 17608 bytes
SHA-256: c5798f8e4121e13764dc0b41caa4f16a39e1fcba385eb0a34b4323fd831c2b74

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