Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf6e920f3f53eb8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 17:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f88302cdd2922c1c2144f5ffe3d63c8b SHA-1: 6fbcf19ba5ad4a3db233fa016cd0f528c61a8b36 SHA-256: aaf6e920f3f53eb876e835ff89c0439718db1a0ee2afd0b3a46ec25a82124fee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608750e737a73---12975912390.pdf In PDF document text
    • http://iworking.vn/uploads/files/91177866834.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/51688190388.pdfIn PDF document text
    • https://medtek.vn/storage/file/jizafavelowadunasowazog.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608834052fa15---saneluxiwokoz.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/88111175226.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dda3899dd---25239200831.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/naduvixusijegag.pdfIn PDF document text
    • http://askort.pl/Upload/file/75227086091.pdfIn PDF document text
    • http://perksys.com/userfiles/file/sawizuxobofixipure.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092337e6b05e---82488908369.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/95542131198.pdfIn PDF document text
    • https://wita.lt/images/files/kakinivotot.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/194eb42827cac9a3cf0f0f92756a2415/64833447539.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/vujibowamagojitemovitad.pdfIn PDF document text
    • http://absigorta.com/E/file/20547398568.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cebg1o8ttt4lo17dc2bln6o0g/rilibejujakema.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/47336302540.pdfIn PDF document text
    • http://donghotam.com/luutru/files/30150015459.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608149bf5afab---ligakuxogiregiliwixemix.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/86770614019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bissell+crosswave+professional+manualPDF 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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 19100 bytes
SHA-256: df05cb300f10132e80b05e272267f4d65b238938e8bdac66ca6179a2100c250e
font_02_sfnt_off00013058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 10848 bytes
SHA-256: 6b99cbbc88e854403802cb9614bd3129e0be8d29151485caac997cdcb331dbc1