Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd05d3f22efb5da…

MALICIOUS

PDF

73.4 KB Created: 2021-06-13 17:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c99ea21d87dcc7a2efad63d668be9aa SHA-1: 31154e4a1a2dd76662415683a236b2148a3bb908 SHA-256: ddd05d3f22efb5dae2746e052c1eb12c2fa257170bd7fff96737a5b44b0c324e
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to loan calculators. The presence of external URI heuristics and link farm indicators strongly supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://drafthe.ru/uplcv?utm_term=housing+loan+emi+calculator+excel+sheet
    • http://abpaluso.com/upload/file/xuzerog.pdf
    • https://biothiennam.com/media/ftp/file/69731362162.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609030e9f1c26---98850898564.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b620a9d51c---12896745096.pdf
    • https://alternativecarrepair.com/userfiles/file/92589605266.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/81dbe2780efdd55a1e2829f9d18912f9/tilasuwerewevubutejuj.pdf
    • https://ferado.vn/userfiles/file/baxuvutoranoruleluzig.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3dba582b---61918202730.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd0c5150e---57548818248.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/809afca305ca3c2a584a557948636665/gifomakezawutilekezom.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f1e73266---nunapiru.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/36522392772.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2ts4heqn5tuvb47fmkum8lib95/sekazaxusomokil.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f6c9ec959cea2c2d41af3deb74098ab3/49651367373.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_off0000e011.bin
f831eaab22c2328dc8f82f99bb3ecee21868977005657ebcb7f62a650ceb4bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 5240 bytes
font_01_sfnt_off0000f1ba.bin
064ea16cdd3873df266bd78cae7e06f93b37c2c0d5085c6b49b8cba8a313e8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 10932 bytes

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