Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3d32a72ad32c68…

MALICIOUS

PDF

115.5 KB Created: 2021-07-27 08:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b612a24966846dd05c9f0f861b81a32 SHA-1: 0430016b1ef850b3a3fcac0a34ebef92a32295f6 SHA-256: fb3d32a72ad32c68b7d3555dd706abddadaa7c387bd54d12634710646a384cc6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf0e9aeb3---54654156508.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3444947d---35297407740.pdfIn PDF document text
    • http://dentherapia.hu/files/file/nadefosipadizokidutomina.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160daa38725626---10587900823.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/llbesmdr46h9maijs6belr7tt7/72473698789.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/suxetabifipogixurogozuro.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0572ee85a---72211870731.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82274e943---92534369095.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/95485695440.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f86eba2be38241adcb1818f989aa95d2/motumamivijilawidojozu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c130948db---samibagadixokubenuvurizaj.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/5705188069.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fexolosevenosikukefu.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/93844333219.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/dizalugu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091923b7d49d.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a5a768b7f1d788938bca991301dbc8c/45271345690.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a60d619cf---pugevex.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edeb779df7---93053323942.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/papumiwejuvoloxupolixifaz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a655a0a548b---jozuwaxibofutuk.pdfIn PDF document text
    • https://kham.vn/userfiles/file/81097552566.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9938db9eaa4ccd026d8e536f6662bcf7/60819551941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=que+es+la+clonacion+humana+ventajas+y+desventajasPDF 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_off00015c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C51 11004 bytes
SHA-256: 3cd4185f9a2dc3d7da8f0071945e396fc8d6c0544ed90c45b06bbdfe798fe284
font_01_sfnt_off000175cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175CB 18388 bytes
SHA-256: a8729d0854fbc741ee08711d632bda84c30973a0e95f0c80061447a47ea82020
font_02_sfnt_off0001a56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1