Malicious PDF — malware analysis report

Static analysis result for SHA-256 788e0cb4e7242d0f…

MALICIOUS

PDF

91.4 KB Created: 2021-09-15 16:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37a21cfea476e99913fc644f74910c0d SHA-1: 481bf18217b9785e20e1e90f797bd4350d6c3b19 SHA-256: 788e0cb4e7242d0f16a24179c7a03dbbd6a02439dbe2d1e0174573d25bb60157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which are identified as potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://businessnavigator.in/ckeditor/uploads/files/mixaroparazazufarezasa.pdf In PDF document text
    • http://cisseo.net/userfiles/files/47819623662.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/59623817473.pdfIn PDF document text
    • http://dnepropress.net/files/file/82788321792.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/diramim.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/24188246640.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/gelekex.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/11310133410.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/donafamigozakujeva.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/gewumuzejatosukon.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae6a5b83c---71454037456.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/rigazesamapuxu.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/komeg.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lodalaxodikiselinagov.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/madowuw.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/76c9c9ab2f358161ce87cb446ac5dee9/domukofevefuvinitovogif.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa05ea6710---53367636418.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/32768547070.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/88788892208.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d5hhq3gcfjga9ai4jmlhhn03u/90596103502.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/nudewos.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/jubijida.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/4959404525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=x96+mini+firmware+update+sd+cardPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/xesukavisilubeduvaro.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_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 11144 bytes
SHA-256: 2107b62e61b0346c9d61df119141b6bf925a911dcdc14621a2f728100b3ac80c
font_01_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 17284 bytes
SHA-256: 9bd9f93166f8358005e1636bb73ab83342206ce01274f2937fd32f170924d4a9
font_02_sfnt_off00014749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1