Malicious PDF — malware analysis report

Static analysis result for SHA-256 6746e8aa044a8351…

MALICIOUS

PDF

103.7 KB Created: 2021-06-24 19:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 71a010b8ace8a04415a5216c48631c6e SHA-1: 77d3ec3540f7c938409b699a3c5bacef8a8e2697 SHA-256: 6746e8aa044a83516947456eb5a7c223d2aca43926bcfd21cf5cef82af203308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the overall structure indicate it is likely part of a phishing campaign, potentially using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://latework.cz/soubory/43828094238.pdf In PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/jukagobap.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c203edef2b---3580417187.pdfIn PDF document text
    • http://dentherapia.hu/files/file/nolixuxuku.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/2011b4f52d4cd4f22e6a4eb000204c07/73170363547.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70293e689---joluwibalosebipane.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b956af77411a2a5e49f5c0816217d212/linepe.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/tblbpvjgu3g1mlqshmugp0bgd1/15734118740.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/b4qbrhk8len72q2nmtvfof560t/nedavamemupijarokisor.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ul9uuian04bsdmacj8bo85b256/7211121065.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2abfe9de33fc28bf88a03d0152ba7f1c/giguritowifag.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbab45d7d2---xuzibewutujomonegiraxi.pdfIn PDF document text
    • https://maclashoes.it/file/80570878343.pdfIn PDF document text
    • http://0930actress.com/files/files/5561639439.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/josusugimenumivil.pdfIn PDF document text
    • http://imaginove.eu/data/Files/wizas.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pijefemodumid.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/16848374393.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780108bd282---xoxugabekujowinidanotud.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/GLLx1DTH0VQ/uplcv?utm_term=13th+age+bestiary+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_off000156a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A1 5632 bytes
SHA-256: 2d2728a4e9bd7391d3208be5745311945cfa467b0c15e7a7419eadd4b2ffc86f
font_01_sfnt_off000169d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D1 11484 bytes
SHA-256: b91ac103d6d69bb6f984a56480cf26365938e625e05942770e3e11f85491be28