Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc5482965e2f211…

MALICIOUS

PDF

172.4 KB Created: 2021-08-21 19:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd893dd9edcca606f314fd54309e430c SHA-1: 31a0c8e60da389959f36ad1290b882da11fb6202 SHA-256: acc5482965e2f2113363c6de690f92fce7444d109c7f9428bd264f866939740c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links indicates a phishing or redirection attempt.

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://fobosgrunt.ru/files/ckfinder/files/logijozabi.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6b291f76d7e1d49893cd59b08be9f020/xewojuwitela.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089db10b5433---74109491387.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/bojemipufekowufizuxabapet.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2f1f83f36e3ba10f7197b4cee71244aa/durajezokibezamasujagidi.pdfIn PDF document text
    • https://ovalpolycoats.com/media/25126570790.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5787b597---52108151541.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/67072982468.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/16974192379.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gudipigobiguvofufo.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/8ju48qv7korvcd52th0jcce0jt/32612893572.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607954aaf1984---teluvebesalakozisen.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/wugudafaxazodijazoka.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/zexalaseronokilepusu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kmruf6nku656gapum9edo4guqe/79618956651.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/4843253823.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/letavudewitezowisavuje.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/butofidifokukozejakadog.pdfIn PDF document text
    • http://yuha.be/_files/file/bunugerotovotuwixofonoma.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8213b909da3ee5cc6d727da48ad04ced/65024481435.pdfIn PDF document text
    • http://mousike.it/img_ins/files/bibefejofonuz.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9b2c92022---15079859505.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/71732861573.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f390da5cc0---mutaviludesixaxexinuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=witsi+witsi+ara%C3%A3+a+letra+en+ingl%C3%A9sPDF 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_off00022e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E95 26352 bytes
SHA-256: 35d1506b9523cb885bbfc4e3a6e4177712196b3acbd0984f49e56557e6f3bfe0
font_01_sfnt_off0002711a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2711A 10660 bytes
SHA-256: b03780bfc37ad2f76989c01508a6e2f0ab581a5ac8b15b09b07419c1277a3955
font_02_sfnt_off000288f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x288F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1