Malicious PDF — malware analysis report

Static analysis result for SHA-256 303f113fed6d42ca…

MALICIOUS

PDF

101.1 KB Created: 2021-08-12 23:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84d0980e12cca769f0f42c3bf2640833 SHA-1: aad9d5c39367fff3ba1af305ef5a0f9392e018c2 SHA-256: 303f113fed6d42ca2156696c53f59ceb080c55045df2ae6c16ef81dd0c815973
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5785be59056f221a0b0f1d2159301036/49729259472.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6bc7c625a04a8ebec4372b328dd545cd/15755500777.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160942926e0c07---zugekomorikotadewoxotizi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/79288218736.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072422e484c9---xatuxakewavuwugi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/sonudududutaneram.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rarixadalolibipafifaxap.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/abe96e15453061cc5c5c65e082f75325/nelegigavozirikosodulot.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608445e76aeb2---59528969151.pdfIn PDF document text
    • http://simonide.org/userfiles/file/zatofevogofojajekubata.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/jegopezejuzowulunelik.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebad106b44---nabaxifox.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/latadotaf.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa04385ca0---88985471283.pdfIn PDF document text
    • http://unityproductions.com/upload/files/11088489548.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/47697802602.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/66439996283.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/mavug.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc45f0297---91891017112.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/87913422922.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/49434485355.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mlqscnnv7d713tpna4ageg3sgd/53932898655.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/pozigopibatidojijijupena.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lafuxuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=teoria+funcionalista+del+delito+roxin+y+jakobsPDF 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_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 11108 bytes
SHA-256: 3973e1cbfbb070976a38b2c44f992feb1c8ce55f31f958f3b4e3a36fb9d0d1f4
font_01_sfnt_off00013c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 18492 bytes
SHA-256: 0a1a78b4f6f00a9dc3d88e7944f6bf9294a388683a3a25a5a60ae52f2fbe6b34
font_02_sfnt_off00016b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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