Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef21873eb3c8e229…

MALICIOUS

PDF

86.5 KB Created: 2021-08-12 02:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9b612c1f400041934a47520044e8581 SHA-1: b78962aae151d2e6230affb36c1882c3ca2d6970 SHA-256: ef21873eb3c8e229e206e99ac32e159241f57ed9a80806d4ff52bc5f36a01d52
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains. This pattern is commonly used to distribute malware or conduct phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://lesura.net/userfiles/file/93077194485.pdf In PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ddfd787827f2152c1a2d46462e68be03/91352693181.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3efd88010da74c82f6929f09eb21a33d/vamaromegusop.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/238b1f183fb1f591f10fabf8c52e7943/60576286666.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/47920006970.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/rewogotapifosavufinano.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/35752645682.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/961089d8e48c8d8805d41657af896540/35836747946.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/rekode.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/21387663066.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae53a8f8---gavapusemepusowafaso.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/juxovetopeg.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/iorp83i7ljtgk3si3k8f4kvh4m/27825866437.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9be98a55a0d737961e545c48db054046/sixikugekusep.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6d7da694e7387eb86f6b98cd4b966ce3/9814150382.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ms5erciir3m2lvb88ei1fu6fpu/fenupovimisijelenuj.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f79ca15d---jodajorewuvopowopu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/22207167187.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/sunibezid.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/75996fbbd30d5ec77a63d004e2eb8440/41900832466.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/17703638487.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/bajuvafitedat.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/50176875505.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/lajupularedosifetazojeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=histologia+del+higado+y+vesicula+biliarPDF 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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 17564 bytes
SHA-256: 5d057851a0ed82be74d7bd299bed6ff497650669b16bd5dad5f4ea59283a97a2
font_01_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 10956 bytes
SHA-256: 7875c82f3f6e029c9f315e20b49492e3d5cc55d85915eaf4acc9d9ebb9882b88
font_02_sfnt_off00013160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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