Malicious PDF — malware analysis report

Static analysis result for SHA-256 8685725abcf9540f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-23 08:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7e0f8b644fdb471070ee05b212505374 SHA-1: 2e14cdaf698394764f299371faa633b09a1da25c SHA-256: 8685725abcf9540fbb4a36cabcfc4f957a008dbf609fe8eb5b8a150368c8d715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sainaudit.mn/File/mozukanefigifon.pdf In PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/34443622610.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/fonuvoreganekiz.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109111619272278.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132350b797bb---kemalelunuxifaluvuje.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tinexuk.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/8124772692.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/wepupegixapug.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/16130748771.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/452587ee0c3b7aa2541259102639afd2/noboxi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/28822316973.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/69052873491.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/surexijutebewepexemovo.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/8128343081.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142018007a12---27830877225.pdfIn PDF document text
    • http://medica-brno.com/files/28030854066.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6fb3b0062658f61b36120b26dc80ae67/losuwomiji.pdfIn PDF document text
    • http://darec.sk/files/files/32766130010.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/7377166023.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/dusividilo.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/nazamizobikepixi.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/51282667784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dream+league+hacked+gamePDF 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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 17868 bytes
SHA-256: 31eff051381cd30b330d545d0064f9751bae63fc0ffd44840e7ffb2f945abb0d
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 10428 bytes
SHA-256: dfa6bd79448b7bf42dafe7f88d82762ef69464c625ae7945302336a26ebd56e9
font_02_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1