Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ada42f661c020fb…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 03:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06e0d55fc5505e9412d4635c9c593c4d SHA-1: ec85707c5678555ef10af78b5341d7ed167c0787 SHA-256: 4ada42f661c020fb9e6cfe49047df4f12977dc924139eace2d7c63ba2316ba64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true malicious destination. The presence of these links strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://drafthe.ru/uplcv?utm_term=vertical+wind+turbine+project+pdf PDF link annotation
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/eddecec9358003b0dd4892d5b8a0920e/kajasefolirulitijegagaves.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fe0345fe---livupabivonijojegamaduve.pdfIn PDF document text
    • http://www.bash.cl/media/file/beguzoguketimodakija.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/72009054421.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092797c06aa3---sikozowore.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/18010597611.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/52628565833.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/44433106587.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/lugovijiwesevibalexure.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f36ce6804---mimobugivola.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3965516c5---78294534356.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/npooho9n5hc97ilg63ff99hasj/buzikowib.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/53878694545.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/ririritogazewupozak.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/acbdce8272e5f423b8a3d6d8d3560b57/bizenuwanujawatugopes.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/sexirubofuporipofuteg.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161083a06f2888---pavubajidetijusis.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/867b07028ccd27dbef2ec005ede481ee/gawebadixelumaka.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c052474ba529e8c398123cde15698a8c/47662997379.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/87619496325.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/56697611883.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_off0000c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 17428 bytes
SHA-256: 51882eff9488c06eefadeec4510ad5f31f3b6041753e704d2173b5fb7075f0c2
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 10868 bytes
SHA-256: 33ce4c06589a9c7abb7c533d09922252df1a3e7e548ea75a69604a789deacc4f
font_02_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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