Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded2989ec1c84f73…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 00:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f126943e8a9c060c8ed5248d4ea618d5 SHA-1: f6a9f13d18409b4279e3c5c1ee705ae08dc46b97 SHA-256: ded2989ec1c84f7330b55c01ae8fd0229aece9bc2fd8bfa04c4e1cb0d0178622
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a tactic to distribute or host malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The document body is unreadable, but the presence of numerous external URIs and compromised host links suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130d88deec0b---nipotedeluxoje.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d4f09e7e65ffa83b522666ea8ab4823e/54319535468.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2b4ef9f6---naponidemapolunab.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210624_CDB1C132ABCCA69F.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/resijanobedupalineb.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca5238db2---xabavijobe.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/83276720829.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/57064c25f1870df606a2c7c59f49715c/32883117362.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202108291733591024.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79266ccc67444d91d7c48715b990e4b3/68573821046.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49c0308c24---kujisupisobakomenogamefop.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/69776145970.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/bhbtptlq007m2rg6j5jfijv0f6/22532214908.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062008591470554.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05e65906c---39668660695.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/55865321615.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae6112417c93ea972b52819a8b4084f9/71824924497.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/rajamon.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/pifapaf.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/kanidebabuduf.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/26058893243.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/35568868329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=grundgesetz+deutschland+2015+pdfPDF 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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 11316 bytes
SHA-256: 9db8ec5bdd5b51a7221b0877e3186f0ac5025b4205d4a544e66083adcacda6c3
font_01_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 18676 bytes
SHA-256: 413fe34d533f86dd0ec1cc480d255061e5eb0f596821b94f02226353580e3887

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