Malicious PDF — malware analysis report

Static analysis result for SHA-256 189fc9a20d714f31…

MALICIOUS

PDF

90.8 KB Created: 2021-09-06 05:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c371885d251a09cac397d22c8919b157 SHA-1: 6d8190a733b3ead36c9b0988a76878600a0d34c5 SHA-256: 189fc9a20d714f318f081922842b28ebfdcd785875befc3179db873f148afb16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://zae.me/datafiles/file/raxukeluvamezesunufupedur.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5inrgvqk8a9vht2msve8ott700/fefumizabazemadufejobabi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/undhgmuiofthhpof8lau02vq23/jegati.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kenot.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/vukosonutel.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/37aedkgn98n60ijrgsp67invh7/70862419847.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e24c1c0e1---72619014345.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/gizevoramowepe.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5207b226931e76f7290e1ed6e06981df/jamasuzolobat.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/gulaludezoxovatefol.pdfIn PDF document text
    • https://mytopics.it/uploads/file/vofofisegifizoze.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/12625380324.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/98834988299.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/16158967723.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/52433000427.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe2be3280---44534381576.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///31911590027.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/db5051d128f433231b5370fe6ac8fcc0/5781874766.pdfIn PDF document text
    • http://airfa.it/userfiles/file/8735808305.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/41702854889.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/29890820001.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608067ef874c2---79000286999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=uidai+exam+questions+in+kannada+pdfPDF 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_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 17512 bytes
SHA-256: f63aada36aab8a6fc09ef478eab344db2243e62f3d75f616b9cc64ff8bf75b9f
font_01_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 10960 bytes
SHA-256: 936fa3ffd5101e560a0af35cd7966a58891a6ee393c1954ffdb8b538fb88f9a6
font_02_sfnt_off0001457d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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