Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a856b753474b237…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 22:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ea375803a547100e2ed6956e32b7242 SHA-1: a91ca1c1020ef455b63ddc4ed58cf61d3041715c SHA-256: 5a856b753474b237e0d29bcd6b187578daf73783c061a76c1bcef7e7337c6022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farms indicates a phishing or scamming attempt, likely to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077133168a8d---jumetavileluwuwadino.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160961723cad7d---4199054792.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607455515c25a---sutogowaselulilosupap.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2ed9ac557b76a84d1eccaf60a638ff79/tebitutunide.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsb3p0bmnfllkjam3vr9sjs6sp/vujowonuvugutuvagijosur.pdfIn PDF document text
    • http://planetamama.ru/files/file/93134318134.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c9306eaa0fdb79956feb4f705e768652/rajigabujewabusu.pdfIn PDF document text
    • http://unseretochter.ch/images/file/51064881574.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/99f6653ceba3afd22c61b04a5bb6798f/26548008625.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f92529b4---79442085327.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1f807fd2efa59778297514a86d50193d/sufomazutewapujig.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/mesovifobekexoturosiwa.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/9592737796.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/giwamujopewutegekokudebo.pdfIn PDF document text
    • http://101balkon.ru/upload/files/wuletovoxi.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/visem.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/veditisikajavipenodizuki.pdfIn PDF document text
    • https://gilbertems.com/videos/file/dowikesip.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/50e16eb152e3f64d9e1663f356534386/45581924158.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160862c50674b9---puwakobitegamoniparuturo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/09ea7245096fc6a3de0d462c7cd32501/70362741611.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/27607404550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=application+for+school+leaving+certificate+in+english+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10944 bytes
SHA-256: 376c06ac3e441d14f6aedf41aefe65d4e6a21e4b49107c93d416bfee0f3c7274
font_02_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 17828 bytes
SHA-256: 7268bf756fc8ddaef0addd3f41b58638a1ddbe933931d8917952f75f7c02164e

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