Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d69a785a9958d7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 15:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: af8b3df4d4ddc062037b947fd3f4f93e SHA-1: c9026fd40b5ad905a318fcc01489a49336f14ad9 SHA-256: 06d69a785a9958d747b95d86998ac0024243a9cd886cf23988e70df9d4cef077
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130738115176---bagokufew.pdf, are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mdibju293q7jm8du6jo8dmu175/ruvusinemeladi.pdf In PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/22295039987.pdfIn PDF document text
    • http://mylodge-naoshima.com/11081091094.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/dowuxetedukusa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613317eea0e1b---bopepi.pdfIn PDF document text
    • http://hadt.vn/upload/files/miwudewowuf.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecef5479e7---kazukatatuvoxebo.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/17894216715.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/38328981167.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/litejoparadekebif.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354cae3c6cc---dulowinopokuvifedip.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/laxupugenofaxamawerekovij.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/46412154562.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140237d80c8f---fetofew.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/xoziduda.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/13283531265.pdfIn PDF document text
    • http://cartopack.com/Images/file/ratuv.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/63230465363.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/83bc27068f15c0674e5370e3dc263db7/9605329160.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/xasofirewupominelurese.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130738115176---bagokufew.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kijukasexilovisimurum.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/96778702742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=application+for+sending+resumePDF 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_off0000b47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47B 11044 bytes
SHA-256: 6033a1f990e9df1615fb03e1b768514de6cc63c5fc6e691d1400f218997f01c1
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 17124 bytes
SHA-256: 471124bf2970f5307f0910f69c5054395eb9441f3f6043ab72906d4d8743b591

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