Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8a60cb284b558e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 16:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4658b9df5befd0e8703068b8cbc60e9f SHA-1: 861a9d46a6fc7a472bc21a871c3ce185afbd664a SHA-256: eb8a60cb284b558e7ffaa436e7fcf5cfbb96a4fbc0422c508d318724f31ea7d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tomboy2.com/images/library/File/tebufeditu.pdf In PDF document text
    • http://bayanairag.com/uploads/userfiles/files/89608669354.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/90225728346.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/77031682186.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/vesopakazuleluranomumam.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/47132160174.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/21889937849.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/40636734301.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/nibemavamisigisewarudeju.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/lozumabivisa.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lejedajivefivose.pdfIn PDF document text
    • http://esteel.my/userfiles/file/58290168440.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/438ab7a8e95d61ffbf1194f4cc02f458/87004098139.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/17097208883.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/wojijew.pdfIn PDF document text
    • https://ienter.bg/files/40943764834.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0c4a9d5118efa3294fb2eee550041c18/93314611577.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e412308c14---pijevi.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/68378304909.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/kafanefolaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dr+maurice+heinerPDF 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_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 10164 bytes
SHA-256: 60473980e8a73c8a731e29793c53c8d379d9bc6188bb980c5bee8d68bdffa160
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 18592 bytes
SHA-256: 9d5696ad5c832443ff529c3735e6f6ae1d588ad90575259e45eace453949ecc3
font_02_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1