Malicious PDF — malware analysis report

Static analysis result for SHA-256 577646be57fd68df…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 14:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12022628d62428dc2544f756881f6f80 SHA-1: 11b53b63ef2f5d69e5ce1c7bdb2753eb59cf39c3 SHA-256: 577646be57fd68df268c2635be62fb2dcce3fe7ad43e31547c576b60fde27a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links pointing to compromised WordPress sites, identified as link farms. These links are likely intended to redirect the user to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/eb51771d8b03b4ff0529a9594fcd49a8/77614207867.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fb05b2045468cf55813087c8d8d59f7c/janiwe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714766a755d---7214860225.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/89875702929.pdfIn PDF document text
    • http://absigorta.come/file/tonugo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4c69648dc92205399ec80677cd9a9db/dakikolonukewatakaned.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53c24a0125---zineduxojagogode.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a3132d5d7---bomelizanu.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/doloxetazamekegokaxopofem.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/93beb506c668baf433e3a482278f165c/wexopobeberovisapajik.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a1a2bf125562b1b49d0aa9b8e15a2865/35710976034.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0645c76cc8---64856702856.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e75ce3021079e232cbc7e232d199ca45/11738111002.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e7f44a73a---95956900951.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcee8e5f88---bokemudurodotazoxakejaso.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fonibifavutixexelixabes.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9dfd6e9c---46257121103.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c28ceaa30d3---fasixisusun.pdfIn PDF document text
    • http://goref.ru/files/file/69730789056.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c457f52c5ab---tuvesikitikeniki.pdfIn PDF document text
    • https://nadamasristorante.it/file/bipugemikidijelasiweka.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084ea76992cd---dakukadepabafewurix.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/tu85mi2pq08jsffnttsoir9bg2/sodakufo.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/70832898591.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/pepedovilexolopebepo.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/25751616235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=corruption+in+cameroon+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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 17912 bytes
SHA-256: 763f7faf50ae9b5f1ebc781e7b36b70e9ab0e0a7d3f45b61cb118ef39079bd95
font_01_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 10700 bytes
SHA-256: d86e6d23ae027b64b4de9b7df388d75d6932ae887aafba938e2b3db367b36fbe
font_02_sfnt_off00013699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1