Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd66ce225e170644…

MALICIOUS

PDF

94.6 KB Created: 2021-07-02 03:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e54f7e44c21e8dfe71e1552e05c89976 SHA-1: 9ebe0b6f52c68db42598ae80ba927c4e09ca3d08 SHA-256: cd66ce225e1706442c070cf199edc3df9fef3139cfc4090a1fc3c58e10f7bdd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The structure suggests a link farm designed to obscure the true destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d72c96223b42cec3067977d0db455626/nibawekituvakuvozeso.pdf In PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef0552fb91---serutomuretezil.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/edd8524d06f276b9ed37ee55086b661f/pizijewunuteli.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b4mf17ph7msbu5ne0rvkp4nh37/15548756959.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/26pk1jk0ssk8d2tgn6b2q3o10o/12648254580.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/zugedoxipulosarebuvib.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/454778393b0dcb1decec0b81c75506da/98246710641.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/5062354b2946105167ba466103c8f80c/wixapagafolesawikatoge.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/75df5bbba89491f5bc064027061fc88d/48612977045.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/40511616049.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/fiketije.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085258dbf908---gixezin.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210601171035_760672351.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/16286633710.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/89832442026.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f4c89628107ea20fb40297cdc540f9df/94643459230.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/64ad6536508b86a809e746fd2c0fe0ef/94854905383.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/puzalo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51a3b9624---97949485551.pdfIn PDF document text
    • https://ka-base.no/images_content/file/sarebumixu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mn1h7j9mup7fn07ncr4gif0457/70374931056.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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c561250d714---zewijugugubovofap.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/84s3nohi32p3i9pakrinsq1vb7/jomirojuporetofaxipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=harkins+theatres+southlake+14PDF 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_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 17620 bytes
SHA-256: a587d21f7eea58875a8dacfa7510453d45b9edbde468a7274a3c7b2c1ed2dc26
font_01_sfnt_off00013d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 10516 bytes
SHA-256: 36f15e7cc852b88965ca6b796c6f037cb300effab69f3fed723256c766072cfe
font_02_sfnt_off00015525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1