Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf9b27337e0f0d6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 06:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d9bfc98d85ce9fd3defc669229cab1e SHA-1: 959d4a425bd5c2f76773a0af7a38ee0e695ad4d7 SHA-256: ecf9b27337e0f0d6c3f89e1471f9c19d60455a8575478b110bbc00f2754e4660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised or disposable hosting. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://classconnbio.com/img-jacson/files/pijatobazuzavexili.pdf In PDF document text
    • http://aeon-dev.com/uploads/files/202109071015136274.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c0237e78---52671715502.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xirapasobexikesepes.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/kowoja.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/podiwod.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/ximazedetip.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090119253691.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/7693305570.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fd229ff8aea4b9a918ad947a1d2bbcff/ledisaxedunu.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/xunisixo.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luvuxipu.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/96778895267.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/silixiwidevegilagox.pdfIn PDF document text
    • https://emenu.hu/editor_up/11785419895.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/86993464008.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/35554785285.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b582cea3ad---guzikafolenaje.pdfIn PDF document text
    • http://cartopack.be/Images/file/gudepirure.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/896b2f818829136fb7999420654e3aac/tafatari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=teamwin+recovery+downloadPDF 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_off0000cfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 10496 bytes
SHA-256: 86de048464f20afccc823c7380e599c99d8b78e0688b28e78f8ce6fff7bc0d3f
font_01_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 18264 bytes
SHA-256: ad7d9664da2505839b5781af4cc3cad9815a6a85a069106e96f50b0a1d676c0d