Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad0b904526429a2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 04:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81f0f8ad72064c7053ad63d3bfe556ac SHA-1: 7b7ff8490471069557021800d7dba7de85c1e43e SHA-256: 5ad0b904526429a2a090cc577aa74d6756229a607bb918989c5872e17f3a8811
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to disposable or compromised hosting. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ikincielinmak.com/upload/ckfinder/files/getegidexatesafex.pdf In PDF document text
    • http://www.tamtrebinhminh.com/public/files/januvawolinigexagikatu.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/vefizenipoxipo.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/23037973539.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/80686357638.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210915_2C8FDC40856597FA.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/liwugimefudatimulosat.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109120054375029.pdfIn PDF document text
    • http://sbcnepal.com/images/file/91200580079.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613257148fbfb---pejezoxu.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/selubasibukuparoduzema.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/29196220986.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/10525462781.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r61tk8i7ggok75n8kp5ap5d03l/1566982173.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gexupelozega.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144c5f78c2c5---44109110205.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/zixisifanuzup.pdfIn PDF document text
    • https://hirurgija.me/files/778455617.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3ac6016d---nirixisenuvaxesejosuvab.pdfIn PDF document text
    • https://jjpremiers.com/files/lunewobuze.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/54491976713.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/dexorori.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/24158870529.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210923143747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=live+moving+wallpapers+free+download+for+pcPDF 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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16976 bytes
SHA-256: ad1b65861f634eac5136cc04a82d423c88936c1a4d640b82df095cf44e671dbe
font_01_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 10972 bytes
SHA-256: dac15c70cf5d8c812053314f9e35cb8a55b17f7459c639f61624336a2e59c771