Malicious PDF — malware analysis report

Static analysis result for SHA-256 945c57405fadbd02…

MALICIOUS

PDF

72.3 KB Created: 2021-06-29 10:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6bed1d6cba0a31c7969d949d6cc0f540 SHA-1: a024c9d2384ed7ee8d96c72b2a21592714708378 SHA-256: 945c57405fadbd02b98f96e555383fff32fdbc8be2bafc749a12f3f8e0bdd1f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure is characteristic of a link farm designed to distribute phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://majorsagilekvaros.hu/uploads/file/11683221752.pdf In PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4guf38dh25f75fef2vmvtrod8q/32577728755.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b77453d1ceb---97010154341.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/piwojuwufebo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/888513d1bdf76349bb7f5a90e284a016/47630196911.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/juq5tpoq4gkblje4kcc30e7g6o/tozidut.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2665fb29f97329508f5fea7549066864/93594651512.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/wodepadu.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/96578834571.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f0b8ef43e902430d77d6e25c5e447b8b/fuzol.pdfIn PDF document text
    • https://plasy.com/uploads/file/sijefebopotemozeka.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/21380911480.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/xanab.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/65873207023.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1773c075660e869cd6868d90fb632cfe/29308167694.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/818a04317cc85bf7b6c780f56772409a/limakafosew.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acab944afca---17326095451.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/93043573697.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb49bedd45---motudizepofab.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1g56jph7p1k5qjpoltpano7cje/45649658358.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/14360515741.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c54a3424e76834d692e3ea2e3490a4d2/jivud.pdfIn PDF document text
    • http://axwelindia.com/uploads/53559348424.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/bodak.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/iqa8km06krgh2c76uotlt7cnte/ripef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=all+files+to+pdf+converter+download+freePDF 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_off0000b927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 16240 bytes
SHA-256: 0ae8f4e3aa9950b5523a1e4f71e029cc2b84134dddcbf870f377ae504162f1ee
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10748 bytes
SHA-256: 563fe859f26e637c036dd2816255f664ee364fce3b6d0232f99fc797627b85d3