Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e044d2f083c2e2a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 02:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6ad71208ac943e07c19d4be775be5c2 SHA-1: 545fe61b47301d56e9970194898d261c10fe8801 SHA-256: 8e044d2f083c2e2af6c68e67f17f9fa772f594142426462846f9b0e63b69ba06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748dd76859---tisaguzofujas.pdf In PDF document text
    • https://essuances.com/ckfinder/userfiles/files/bavumatugikizuvemikeba.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/xobilezefubisuvetuwiju.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/furerusulasilewurifupejut.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/foxokizujijus.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/37986494766.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/91224163943.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/47933447873.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/98354496142.pdfIn PDF document text
    • http://szm.hu/userfiles/file/ranilivotabaveravatap.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/01iath20m0tnutuhu8t3eoucqi/13706335885.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/50440295939.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/vevurot.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/80525804402.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141658dd13a8---52255085235.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/xirutibajunali.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/dopitosanitejav.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/kofuwevixivi.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/bituditulukenova.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/19461185887.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///54844894209.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/f5jqgdg1rsgfifesgmkd2iag6k/linisolewodesalotox.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/rapatijetom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=super+mario+bros+3+flashPDF 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_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 17088 bytes
SHA-256: af554ce5d286737f68f8b32e44c6dc91ba2257ec7d321f497da598e3c28d9edd
font_01_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10908 bytes
SHA-256: 8e82cdbb9f210facfcb7789f0a03be7c702dc92ec27b8f9e74aeba370b60d7b0