Malicious PDF — malware analysis report

Static analysis result for SHA-256 46149a2a7ca67aa1…

MALICIOUS

PDF

87.1 KB Created: 2021-07-21 07:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de8620d4fe32ab55ae7a0a07780c1e8e SHA-1: d91d8b325b4f53e92cca7b1c472d3c9b6441cd65 SHA-256: 46149a2a7ca67aa188863b8bc6d205e2399e38dfa164ffc970613d789b509458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inncredel.com/uploads/tigebunenosulig.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607235d754ebb---15822393528.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/02uaaju8r73j97emlh6mndfp9u/rokulanasoxujibowigum.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8343888e---91397455816.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e334c6887---10766749333.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5e6f53693a2fce09ef676100cc0c3c75/sotatataterigavawiluwogi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e40f06b1b66---gewinebex.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/43327859120.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/98537208088.pdfIn PDF document text
    • http://abnicum.ru/files/file/tumetezabufajope.pdfIn PDF document text
    • http://teplospectr.ru/images/files/92462465069.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098e1be9429d---98753478525.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/80606137726.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/s852m3umhqsgujjt67pupd7k7s/zilotopibiwotage.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045aee2d42---buxadis.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/91591939471.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/efab8ae3722378a65fb9e4c58f157651/zemodigidijajir.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///80872937673.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/jifevimakegifuniza.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4328ab86327cd70f7b09b4bd0f55b487/25480606480.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/80124734669.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/bokuguvikopedutomu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85ffa1ff5---goridavodig.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/59355834706.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/joziroludoxafofunetew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+old+ink+stains+out+of+clothesPDF 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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 10924 bytes
SHA-256: 5989b8b36bec8d837ee19fee7f00437ea4664bf2c819d36639d6e096591f08ad
font_01_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 16724 bytes
SHA-256: 0de82ab730aa2c93a5d93e199b8383f8da5b377f6a7941827070680984dabc8d
font_02_sfnt_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1