Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99e3e4ff8cf6f11…

MALICIOUS

PDF

89.7 KB Created: 2021-09-05 02:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 347d76c08875b5d0f73d8f4e7b5c0bfd SHA-1: 93c88d43267e7dcceb1de00e6305d2d21aba27a6 SHA-256: e99e3e4ff8cf6f1179a7efec3fe50a378c3492551452d5d32b76d75f35112c50
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yogaschoolofkerala.com/photos/editor/files/31159869518.pdf
    • http://yomamasushitogo.com/uploads/files/48030508811.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/lujudosefox.pdf
    • http://djpress.pl/Image/files/40647485396.pdf
    • http://hondatayho.vn/images/ckeditor/files/samatifufo.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b39dcd88dfa0a70b83de4c16946c11dd/62627057754.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/b62mn8kqva7frm6kupc9amroru/toxegiberodox.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/151472cb2174b20809398cc0b383b118/79463778207.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/fisaxelalopevizufabunagas.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb8547a86a---80983399947.pdf
    • http://skolicka.eu/foto/images/file/8686417811.pdf
    • http://tiendanatacion.com/noticias/files/30913912043.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0c8b0e588794079f1504f04f98e889b1/91232183220.pdf
    • https://ngusacdon.com/upload/files/30542634888.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9f3d57588d20b6ba98706d7fd562fc56/55589145956.pdf
    • https://twr1115.net/files/fckeditor/file/zaxixalaxuxaruwarolaze.pdf
    • http://inter-travel.hu/_user/file/54035088987.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad714916c39---kemesovoserekilekemo.pdf
    • https://hse.tw/upload/file/mefimigixiri.pdf
    • http://myhomeinparis.com/userfiles/files/41544119023.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee4c309e6---jelumuruwodo.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0076c8409---40173502722.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=excel+vba+reference+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d5.bin
6375310288d050e4c4f74e810f74b758952c2b8e2adf7c5e35948cbfd34c3068
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 18808 bytes
font_01_sfnt_off000128a8.bin
aa4b03e65f1e84f6349a338be94b22d164852c6441d09fd96878f0cde8d784d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 10808 bytes
font_02_sfnt_off000141af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 16792 bytes