Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd6bb80ce15db0a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 05:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c75dabcf6c4cc1a948b216e4c9528a29 SHA-1: 720797104c98dfe801794b38cf8ae6ffb64a6156 SHA-256: 1cd6bb80ce15db0afc144497aaea5336236d4d42a211396ea8022e5ab8a6675d
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of a "link farm" heuristic further supports the attack pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://alrabbancapital.com/file/files/dowapuzukinorufozidilis.pdf In PDF document text
    • https://dunaweb.co/bg_image/files/nugoxafekujiligibabesal.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/wasoxemisukosibuboxomoko.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6a9c4b84de612cd0c1bafd1180c4cbfe/69597374961.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/69898156169.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/jufufo.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wovenesosezefow.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/mijepe.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wexozaraxiwe.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/8694787004.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/89710214466.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/23912008458.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/53b40936a66bfcf0182f12ca64639a0d/23791823203.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161367b3eaa17b---88452188347.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/pidijalepuwivosawaxokiwa.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/37291859801c43859d48cf5635294c0a/49504747930.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pugeletari.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/95799711061.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/75034932330.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/22495857090.pdfIn PDF document text
    • http://hjhchem.com/upload/files/84363256519.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/59471086905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+bicycle+app+androidPDF 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_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 10812 bytes
SHA-256: b3bc98d4fb2a18735cc4815d372d03454830d9ae6dd9bdd86ec4aa741e032eba
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 17504 bytes
SHA-256: 39c6e776d90e0ea3d1b4a9fb066687f8a273f8c6aef124a8f9bdee28859c5eff
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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