Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a026769565ab021…

MALICIOUS

PDF

68.9 KB Created: 2021-06-25 08:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f00fdfd9456ed2b56d873cbd154e2fa SHA-1: c53c4a03c1bca1468370cc248e7577411c799644 SHA-256: 3a026769565ab021e2e2b16c2b515a50bffa49e96a00cc6511e5ec2acce0ab4f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the heuristics point towards a phishing attack disguised as an educational resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=chapter+7+solving+equations+and+inequalities+answer+key
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4a488c5e99484eaf21760923a25f1666/24796044752.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/34bd02af785d3d63d00f25d27ad3ea37/xokegadimal.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8e74e0b86eea40976a3e56b5737872f1/45223577163.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/932a48b4f48c6af9277e79eb677d4374/4960426384.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9607g9cp63793pfp9eh4fi8i67/meverifok.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/i3laaesck4cc1i6sbg8umaeir5/72215412464.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/wafegarises.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2a4f1d00c5149c1644ec7b2ca4db7b35/13580100892.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160943c34b2bed---sumijanabadulurozu.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hgaigd8geujs5k34dvhn4ug5h7/nesune.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/193f67d3835f12eb47cca07b921eb685/68756110272.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/kazitinafa.pdf
    • http://hayatteknoloji.com/webimage/file/waxodamidedexagudaka.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b817283a---27175264733.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2a191817---wuduzenijimazodorov.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rg088ldjmvu3li3fac906v64b5/34839820828.pdf
    • http://envigest.cz/upload/file/wovivufugefosarivi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd2f.bin
e738a2d9aea97cf4c0c69d5207c662a0aa2ecdf9cb03a2a0589279ada77f150d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 5648 bytes
font_01_sfnt_off0000e07b.bin
3187a54156249688cc6ed6aaf5f4ebad2ed9ff97ffec2046853855e4dfba20ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 10896 bytes

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