Malicious PDF — malware analysis report

Static analysis result for SHA-256 450f9d476e2cb89e…

MALICIOUS

PDF

81.8 KB Created: 2021-10-20 07:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3dabfd1cb8625fbf20c307c510f2afb SHA-1: c7d11d1d30778f5369985c9267c7c8b4291e62b2 SHA-256: 450f9d476e2cb89e6d49010fab94de7c7dc96414a2bd9be4ef8d42ca65531013
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/73519031772.pdf In PDF document text
    • https://virtrade.gr/userfiles_lybo/file/96535193122.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/95022976481.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pafavir.pdfIn PDF document text
    • http://www.heksan.com.pl/file/lejisira.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616f43cff3431---fokirifixavezejenukovowav.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/xuwafarujujipopenim.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e2238ac841---podizogaz.pdfIn PDF document text
    • http://hbinpol.cz/media/images/upload/file/xibokudivi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8gi5l49p8s4gsvdphr5n84rh25/lamikezuximonuwawupe.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/77136019090.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155db128509f---nunafetisaxanuwagu.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/veduge.pdfIn PDF document text
    • https://ags-car.com/upload/files/4023838776.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161382ed521d09---35438739155.pdfIn PDF document text
    • http://lachina.cn/upload/file/xunozukikebotazapisu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/q3c3l401um2u8b9frlrbpil5a4/65274293514.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/41491903476.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/sakekuju.pdfIn PDF document text
    • http://stl-hk.net/userfiles/74680828775.pdfIn PDF document text
    • http://tajilin.com/upload/files/podosinovatadikiluvaje.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/60943163448.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/81765891225.pdfIn PDF document text
    • http://camonetinternational.com/files/file/rufoxufo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=articles+worksheets+for+1st+grade+englishPDF 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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 16808 bytes
SHA-256: 6e5366895767e43d3346282538a1a8e1e347a68ada84269bb1da400b2b5ac2d0
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 10968 bytes
SHA-256: 668f656438e0847070c5fa55566b8462abaac3485ec161e8610668056ce1c7d9

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