Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf45a38d05f24fc…

MALICIOUS

PDF

154.4 KB Created: 2021-05-09 23:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0a19280d602709ebb30301305131fb5d SHA-1: 261ef476c3fb19c64d0e1839cff3b2ec75459e40 SHA-256: 9cf45a38d05f24fcc1d4c7182ae4f209152838e04d31136314949faa70d66ab7
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress installations, suggesting it's designed to lead users to malicious content or downloads. The presence of multiple external URIs and link farms indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c3dc9290---11458004147.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8b042744f2670dd38daed1cb39b2a372/68668012140.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/vaxego.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/nu5vcs3th40d8h1ba2ipnbpou4/sulizurelejoxota.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/q6rajpivpsaponip4lboe6evam/18301033247.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/qfktkudq3jfchuc62lobc8pmrt/rudixuz.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/58144967220.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aeb5e580d---popenatagopinariguwaji.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672901220b---49347151077.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8efc3b4fd07fce0c15f483e2719860e/38472136720.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/96602508680d0e7494ba5751d4df478b/66942682047.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/58ee38373a2705b4ec013125f4ee2002/9002795337.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/23jut7cum7ekv010f3244tghad/12473868357.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lvqe813g4f67t4c137eq9rkqsr/zuretuxulilazudovatowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=livro+as+catacumbas+de+roma+em+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DB1 5412 bytes
SHA-256: 651c35d10316a97a9764d335e3148e637019ac698936645023e1c7e490a6e07d
font_01_sfnt_off00023004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23004 14804 bytes
SHA-256: 3d2537aeaa28a122e8cd4092b32c4958fc925cb830cdf541b5ba49284790e104