Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed81e39916a4618…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 10:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dd881bf3ec3d4100d6be25775e6f3e9a SHA-1: 9ff12484e5b50c8a27b401e692b7640e71ad4613 SHA-256: aed81e39916a461882ffcda497e9bcbfe635bf5cadc8d153d63f9d37325ca245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=combine+pdf+files+using+adobe+reader+xi PDF link annotation
    • https://broadcasthub.com/ci/userfiles/files/7942351674.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4992d3ea2bd9852860bd68af2a8a020a/13809609098.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/sazokutiz.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/mugilafagokeroxatoda.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b4eb4c1a43e9547a7adfe8a65fb36998/68202172645.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5d8orbdgi5knm3kd871qhp685m/85868587416.pdfIn PDF document text
    • https://hssanesteban.cl/files/lugulideno.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/250d2f4d08aecda65a01741b811fa8f4/13654657358.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/zomipodi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/ratido.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/vutimetaka.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/suzitopaguxi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1d61909a5---gosoj.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e3acabf39f7012f607415e06bae14fb/2619642789.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/048d61b301db72fcf05df45a6f01345a/bofusakivuteziwajomoso.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/mekemefevebes.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/87931025276.pdfIn PDF document text
    • http://vhz.cz/user-files/kojadavujumulon.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf07fe0eda---jikofijubegekuxi.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/rawopomafivumadewutupavaz.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/kotololuzejexeta.pdfIn PDF document text
    • https://labelmarket.pl/data/file/nilejimanejapelexuzu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ab5c1b8e23e6ce505e25e146952c8fa5/86592639817.pdfIn PDF document text
    • 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 11116 bytes
SHA-256: 5f9846aa60d5f77660eb3597bb5433b0cffc4d49b727434a118309443f16fa4d
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 17960 bytes
SHA-256: ab152a1cd7d8957d56b807374f89fa4fdd18ea851475fd72cdc61911bf96a3fa
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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