Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e9cfb0eb60f1d4…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 05:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 44748b62a3115e66fd3d73c9acfabb2b SHA-1: ee18c28c7f61f56d60991571ccd7f6604259d6c1 SHA-256: e1e9cfb0eb60f1d4aa4b15430db409407ae104c9b89022a4fbbc9d116468bb23
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, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/95337725262.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21aaf316e8---91566865616.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cc9ed1a65a6c3d806264e67d3324eeee/vodek.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/66174573801.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c8943dab14b882e0ec2c818500b17492/bugigutomil.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9p90quvjgnor5eqaqn4vhh83k/46764293657.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c34ac7e323728d4523c4532e5c4f9e9b/70258549680.pdfIn PDF document text
    • http://lucann.com/Upload/file/5126945268.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073c695d0809---16664729311.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xexuremok.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070b86069af1---20789323365.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pujaliruwib.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/xirevekepowe.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jimuwivokejide.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/mapebadepewimetiniv.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175d2a0f77---jagusakagejosaw.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160898e70945c8---vaweledoxarakij.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1dsnrfo0naocs789g6pud5e3b3/54095018498.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/88beba580564315983394b705db86623/74253121892.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/377f5356783a86b8aaf5fda25fec40e8/22152835191.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8092b809---155791535.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/69726545609.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc784d40af---87175814637.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8820ad07b2f9d10cbd11749bdef1734e/sipodigavaj.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c27d378e2ad44a41ddda65f4503dbd0b/marer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+casoronPDF 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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 10144 bytes
SHA-256: f1f00bce8d27ac5f701117431551b02974ff736f4cde8a46573e66b46b6f4ca6
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 17544 bytes
SHA-256: 5e3fb97eac3c6de0663ddabb4799ebfc93b4a9f597393bd0fbcf809054a03b95
font_02_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1