Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9cb5edbe269569…

MALICIOUS

PDF

74.9 KB Created: 2021-08-29 12:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9a65a2ebd5d377517ea819066046e04 SHA-1: 254cf3348c581874e8893d4f1a012e8e74012016 SHA-256: 6f9cb5edbe2695698a36522898609240d06d79592c95f9d905ed4b2b38cdf205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ejeorrib8jj4pepgfchc7u8ba0/gusijunarovixa.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d0a95b61---32979919455.pdf
    • http://amphorabeautyclub.com/campannas/file/kavevawufudiloj.pdf
    • http://saatgaamkansarasamaj.com/admin/uploads/files/pejisizo.pdf
    • https://bem-sa.com/img/file/71241337599.pdf
    • http://realestatemiami.com/userfiles/files/sapovetasirelalebedum.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb29397abe---81191607270.pdf
    • http://mnogonomerov.ru/uploads/file/36383155300.pdf
    • https://honghow.com/ckfinder/userfiles/files/85332653943.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/limobirinipaboxe.pdf
    • http://jncs.kr/page_data/file/20210726161523.pdf
    • http://bbfederico2.net/userfiles/file/81272565687.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ea06b502e---wepononudo.pdf
    • https://elnativocoffee.com/silver/upload/files/zewugetibajexefobaxab.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b990b6796b36dce1a59dca12148a6c30/46675471028.pdf
    • http://vivo-mebel.ru/upload/file/maxiz.pdf
    • http://nadiadsa.org/userfiles/file/lezofevovepixal.pdf
    • http://st-ark.it/userfiles/files/2420601563.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/tusurigef.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b253debea46---94832317115.pdf
    • http://bjjiffy.com/upload/dapulofugenogapik.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073366f7967d---87006278716.pdf
    • http://dongsimkindergarten.com/upload/files/xamogugotimubaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+gates+required+to+build+a+full+adder+are
    • 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_off0000c19f.bin
4fb38a3c7044df2057a34c6791a6202f210d74afc14b289ed957ebe00d730d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC19F 16500 bytes
font_01_sfnt_off0000ec35.bin
4ba99d9661890387b0b25fd15e32725aa5b78bec613120e937a1a772c9d1c47d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 10880 bytes
font_02_sfnt_off000104f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 16792 bytes