Malicious PDF — malware analysis report

Static analysis result for SHA-256 7664932fd08a75ec…

MALICIOUS

PDF

74.9 KB Created: 2021-08-30 21:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa49f44174f6425d3e073ea681ce79ad SHA-1: e8f1c885fd8030248e6733f560c989e2908cf7de SHA-256: 7664932fd08a75ec6eabf7fcc4d33339fe086e255718b402f620d4fd8dae69d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and URL analysis point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://digireg.it/upload/gekow.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/df0532c29e3969cd39e87213e4853486/7238461279.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/3922082334.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a9b1dc3f46a669873e4161caafa84271/77500816079.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovio3o3nbvplt60fu1222mr520/muvifovitaf.pdfIn PDF document text
    • https://iword.de/userfiles/file/femaw.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/91382428498.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f15fa68c9218fa77bfd5f63b2be56451/34064298196.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/86a00c31e2dfef8a460e2ea4cdde3238/lawuwizofed.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/83177912135.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/sijijepubudizeliwevename.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ff5275627---36289117954.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f5aea37b02282162795c3c47ee813e5c/83300424614.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d1b7b2d1ea8add648f36b69221bf4856/49375946907.pdfIn PDF document text
    • http://darstin.com/userfiles/files/dofaxagizebo.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/97193376974.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f055962d8c---deresopesuxopanapa.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/b3i17jf6oto96smb9506jml9pr/gukimibovigi.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a315fc02---55527112570.pdfIn PDF document text
    • http://sciattella.net/images/file/77805953137.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/19514911637.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edcb77f0f---21336416077.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/tiwilaxodefuzutuwu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611c17443f3d8---45952438379.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/59080952748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bengal+kittens+for+sale+near+mePDF 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_off0000c3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 10704 bytes
SHA-256: 4184404c0bc699a079b98a7671a32e3bfe22cf7708ce85e29b21e8462a7bf726
font_02_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 15792 bytes
SHA-256: f3d9b65be49e3464dde104ed1a4d8befb7ba33d8af0097cafcdeed805aa29ace