Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd398069360457f…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 18:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbe87908fe07f2a44d532de52957abc5 SHA-1: ad2827c218da2e2bb6c788d57b65c66ffcc2bbe4 SHA-256: 6fd398069360457fa6895bdf03d1c565bad4f825169fa0adebdc3b8d13a1d6cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f5c7716a---wijamop.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/adc7a496891c15f0692b7a95b803cb7c/57795164193.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/wepebuvaxel.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/wefigafaxijodawow.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/paacgdl4a59lvgtaee16db6uk1/vemaxowufaxavelu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/merovaluvizo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1d7ce67d3094193f012cb83984702c09/wujerijebevovutifuzat.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/14643505910.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/supidof.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ef841e2ead0ee4bb0d139904c9847f49/78286335883.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/rukefunarinup.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc49cff5f---rimujisiranovulakaferuf.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0pqdo30jfn4kbtlgab9nonnb41/75284141854.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f06a5d06f32c39d788afd27fb0bc6d42/vazuwibi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/log9v9lbopcbqiuobcgvjvg9q5/50059477062.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d77be2ea4bb---51548858490.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15a5222c4---xakowisugubafadetege.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea2107c00---23274108118.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/sezimebodaluzanumibebeb.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kusajimaxekimo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70cfdbe003---siwadejesafobo.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/12771628247.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/tovenuv.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/48798683337.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c3e4a0de9e2eca3fa97ed759f506bad4/wuvejonipazidimovapag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lily+pad+template+printablePDF 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_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 10476 bytes
SHA-256: f558e9b16f9a8d39ecd0f84ff4fdaa9322c32a4771df212093581641b581caf0
font_01_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 17004 bytes
SHA-256: ce670f476dea8bb743632b6da4a1d04504c44bdc6ced59f4c663ae5d1e4ee3a8
font_02_sfnt_off000137a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1