Malicious PDF — malware analysis report

Static analysis result for SHA-256 6111d210c254a1c6…

MALICIOUS

PDF

84.6 KB Created: 2021-07-05 07:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fa159fc5ac8c42b6aeb1bfcc0840d55e SHA-1: dc6e8ff2d1c55fbfc2266b0ac961656f022b027f SHA-256: 6111d210c254a1c6bbee34084371e274e6ba78076decb53a3b83506c7adb10df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve to distribute further malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab91e3aaf08---45102042350.pdf In PDF document text
    • https://mongolia-volkslift.com/uploads/files/65061199033.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa505bad61b---vejizepot.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/68146290316.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/seboxukezidejomigeteli.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bc4c27e41579e874e0292d1c2c50b40a/97925829886.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/54631834775.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/47647586771.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/40543442424.pdfIn PDF document text
    • https://scriptdd.com/_file/file/jejurovewesegiraxuxilop.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2mfe19o3shpi5bb14c3t5vfao8/11286149953.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/rakutodewib.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/23061828401.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4681e90a---xigudipelopiwojepulura.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/34322727053.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/26476314415.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/50418278022.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/lapuridobosivinefapidef.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaeca4ef3e---3354226182.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/dufemexotinel.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/613eb388a55705eb9cf1e9939457a3fe/27753926498.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4eed974c---15882945042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=castle+cary+to+bridgwaterPDF 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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 17440 bytes
SHA-256: 75ad091fbe70d3fb3da3b120b012d092420eedd67bc188c1b14aca777a7c45dc
font_01_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 10812 bytes
SHA-256: c14540f0f6645847e4125ca74bb172ab08b893c4de8a628488872c1ae5ca227f
font_02_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1