Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a058e51da9820b…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 07:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f879a2345aaf4dd4f8d31ac2cf41605 SHA-1: 8526a82f06133605e2cec96dd164b745e3c684eb SHA-256: 56a058e51da9820bec006cca0a7046175205446ae69b02c5f2f9987165080e8c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to potentially malicious content. The presence of multiple URLs hosted on compromised CMS uploads and disposable domains, combined with the 'Password-protected archive handoff' heuristic, strongly suggests an attempt to trick users into downloading encrypted malware. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=download+gta+san+andreas+mali PDF link annotation
    • http://h04ydivan.ru/userfiles/file/27667429711.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/fozebiwubadaxot.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/21430648146.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/21994349258.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/81298739664.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd724c05af---zopebuduwabekatevozi.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/dedukuv.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/78729762325.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b244313cfcd29f6256a211a0a0426f1a/tavuwafusumevinerateza.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/39308401677.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/66753386889.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/67416632567.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/5540753559.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/72248840488.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/kurofipiwelaxorage.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/74315659529.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/kusagidevivegusigiwavigat.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/nk4t3fcoeu045roefn6omdo4ak/39630391479.pdfIn PDF document text
    • https://zhansq.cn/upload/file/57111677692.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/97548179237.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/puvoju.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/pagonekuxudukukodo.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_off0000bd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2D 10680 bytes
SHA-256: 29bfd87b2bb25124729d8283319c9eda67a370034fa84b011c1b9be44f7956b0
font_01_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 17036 bytes
SHA-256: 95a3f7eef465a41a34a8843fd12f071342e5bd1691aa539abff15f5104348c69

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