Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb18245a62ea9f7a…

MALICIOUS

PDF

74.9 KB Created: 2021-07-18 11:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14720910a8a79cc4699801f0818f140e SHA-1: b1acb4286bbcf1da69546ae0da1e300cf7732558 SHA-256: bb18245a62ea9f7a99b0297cd40abec08ca1f694c4bd8b37751bb32629fdb3a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm hosted on a compromised WordPress site. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a redirection to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5fd3c596---dikowefiniwajimubisebej.pdf In PDF document text
    • https://aquafilling.com/userfiles/file/losuwikomilewapos.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210506200427.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c3f134b2a---zusetulowa.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/cd1c9471adad4f4afc0d65e8fe1ae60d/digibosoxuvil.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d07748d90---kufivebiker.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/225948466df638a620110c8658db460d/96048663966.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/kalapab.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/jogel.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b479ecc100b---tosulagobezudixires.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742652d8bd8---nefix.pdfIn PDF document text
    • http://axwelindia.com/uploads/tarizafalofodej.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f628b552---fanuzaroxo.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8897d8d2fe---68342216425.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/faxodomegizodomabojazuji.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061913471373499.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160734cfd86a96---55434978783.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6bc7ed88f97a6766f15b268b45a32f60/71385441251.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/828ff85c1c7dec66c26e4ce2bf9168b8/wudenugamizi.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c1178be20c643fb4c70257f41076716b/30281386246.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1abdec94---28873184863.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/bulipogaloxitagipa.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/29184903958.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7405ef98a---wotomemugetuluvururuzu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/50d9403f68fcbded2edebb24d7037100/9151356294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cyndi+lauper+front+and+centerPDF 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_off0000bda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 10688 bytes
SHA-256: 780f94b2f443e029d58b831da08296995067554b6139b9f0c4afa35614d92d28
font_02_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 18448 bytes
SHA-256: 761732b60478490426155b6339a8047bea8d8cd33b239a54f2100b9f8a7e8f0c