Malicious PDF — malware analysis report

Static analysis result for SHA-256 a735e46947421a13…

MALICIOUS

PDF

90.3 KB Created: 2021-09-16 06:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c46da356addf73bc821d9ddb458fa354 SHA-1: 46e108046089f23507596d7161295f9fb092269a SHA-256: a735e46947421a13a017a086040db83ece61fa7657173d41486fd69f8705a5b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing or distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://metzlerranch.com/userimages/80473660123.pdf In PDF document text
    • https://autonoleggioassereto.com/file/fuxalevurefobozet.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614123ddd2568---76257447900.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952ebb8fb6---guwusawaf.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/34364419628.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/46024303282.pdfIn PDF document text
    • http://speckrepej.com/upload/file/17508240384.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/33440799969.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/fotagi.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/38866002836.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613277a3507d8---dawefibajozudizuv.pdfIn PDF document text
    • http://maulich.vn/attachment/files/mukakesif.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2e8b29cd1003938848ba7530af9814c9/zufabowugaselafamufikoz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137f8d3e9e80---58061433905.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/82040953812.pdfIn PDF document text
    • http://aa-nusd.jp/5201709168.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/zojudokivamufunapotin.pdfIn PDF document text
    • https://olterus.com/contents/files/12624436774.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/8433717597.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/wudilefa.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/filutaw.pdfIn PDF document text
    • http://timebymtm.com/upload/files/vosukidekus.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/13119679350.pdfIn PDF document text
    • http://guchen.ru/d/files/zufagiveg.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wifevalepikodatiriponif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reconhecimento+de+voz+androidPDF 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_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 21244 bytes
SHA-256: a9b785fefd0d50e8390192694f6f2b31bc73b700e8a202347dedaccceae012ee
font_01_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 10592 bytes
SHA-256: 1e1870246c71a91bebb60a258616ce460fcac13d713ce0f252bb468273a01ba3
font_02_sfnt_off0001436b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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