Malicious PDF — malware analysis report

Static analysis result for SHA-256 6558041937fdaacd…

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 03:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 271490682d492566831313258d56f1c2 SHA-1: d28b81cb5e428671b49777dd44e8d764bc63704c SHA-256: 6558041937fdaacd1a53d99e5b0e672e624a23e67b26774aaf383509c8039d2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=cardi+b+song+of+the+year+2021
    • http://beiwendq.com//data/attachment/file/72374165164.pdf
    • http://wojno-stal.pl/pliki/file/lefavoseropiduf.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nrrg7dqn9285qof2l2bnmo5lsi/17084515411.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811e93fdd1---nobigipesive.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/gowixatimufarenepufab.pdf
    • https://noddy.nu/images/file/13464361499.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rp1nrvt6o2pjrr6bkgju3hk2u7/99150514751.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ad5bab541881eefb7a505fdd3218bf8a/xupazomasavofokogozig.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b89782ca84c3a14d3b69208c26f26dcf/17721126346.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b587e13e4d---18582335050.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78ff73d0e4---worikeropagirenufefitato.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/oaj8r0ks7fmo43ku4l04qth33r/xulinupixuvigaten.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce06d3fb2---44196129392.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/3ece8dea1defba7c16ac30784cb79087/37473592038.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/478m0bkv3922fobs5mcjusdvg1/xiwobasaledaxonuwa.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/313cab4bb9a0de200c2faab3400810f9/3264809129.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b775ac4f8---sujefifexedanewetugerigaj.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6952d141e3---vebevaniliviluno.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6dc9baf0f80c088e8d58deb9154361e2/24223774041.pdf
    • https://allmassage.net/upload/file/20210601045234.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/79968293308.pdf
    • https://alihuata.com/userfiles/file/xepoperak.pdf
    • 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_off0000f34c.bin
55b45baa7d0700d2f90d13d1cee9f2ce91d8b3bdaa19b647c1c1f9346652e80b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 17740 bytes
font_01_sfnt_off000121dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16792 bytes
font_02_sfnt_off000139f4.bin
d901189903eeb6a6310c609982f7c5cf37bf258338eff6852b8d6d8ba087289b
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F4 11168 bytes