Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db2efb0cd6bc359…

MALICIOUS

PDF

181.6 KB Created: 2021-08-04 08:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69bcd5d5ea45f7b00d7038c0468cb800 SHA-1: 0b3815f85f603c7f9caad544aded4c7090860de9 SHA-256: 3db2efb0cd6bc359685dcbc4e646fa9a0076de1202edf06b921dbaefd4b0afd5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://korovin.org/site/img_ufiles/jowosutixiduxi.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdbc206af5---73036976574.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22b5a0de8---44207415979.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ae01946d56bcc66f378366457e9e56f9/benizoza.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/rifisokala.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/32172967606.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6adf9d1814---rokufug.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/84081614052.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c907f5586f---62786774833.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7idl5h3f96ou8urlg7bau8c02/fivafitojeroso.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/8462212299.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/benanuti.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/ledebexixabofogiwuzi.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/jodabexituturukutiz.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/83971884487.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/kazurugoduw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16096750264169---buviwikaxababeze.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fd39941e3---90989963533.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/34879393862.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/9472a50b419be619259786a9a3163624/75244234066.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bab06608985---81312999961.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/bisewupeto.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10bc48b2c---65821636811.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/38e5a047d06d2e660776c535908d40c0/3060100437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=waitress+piano+conductor+score+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A2B 10660 bytes
SHA-256: 0c07de9046b2e03a6b6ad192cb3b5667e4ce0cf03f9f9d6e80d5c686b73d7b8c
font_01_sfnt_off000262ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x262BA 21176 bytes
SHA-256: 3a861ea2193fcd73abb0d46ec714b12d0a8cad112ba16fbf888629777372880d
font_02_sfnt_off000299d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x299D0 16152 bytes
SHA-256: d5c15881e83425d487aa4535732041ac4175ef9288451eb1096742555bdeede9
font_03_sfnt_off0002af58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.