Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4906ee27a5f0e0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 07:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b341068ea68428292b4a12c526f04af SHA-1: 5097fcebe4df0026b316247f9a20ca468669d7a3 SHA-256: 4e4906ee27a5f0e0e9d37fe87df67b993e43168495e07a777991e702f6101d0c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=3gpro+change+imei+number PDF link annotation
    • http://kukdae.com/files/fckeditor/file/92124277764.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95620543456.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/leloluv.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lafusuxozomudapureg.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zerejib.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zanowidovuta.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/vafotejojafekiwunan.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/92191411519.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/dexibonibu.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/vesovepowo.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sedilafakezowosoxowotine.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/nizaziretifedojoto.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/60a942c30a3b47c30967df05a2eb141d/23670890564.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322504e9aed---zugixorutarikepofugirax.pdfIn PDF document text
    • https://norservis.info/files/files/60141081479.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/tojopelu.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/46796044429.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/60739306554.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/fajimotedudezobikukesafo.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xowidetavogafefimakib.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/37545308956.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/85537417459.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/de55b7d6b67ab39ca8a9b8df8775d621/xonefibidivigebivadira.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/wevevegabomifumafi.pdfIn PDF document text
    • 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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 10824 bytes
SHA-256: ef9f834c45be0ebea70c3df653c92b5ee87aec9aed42ecb594f39c1915720ba6
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 16652 bytes
SHA-256: 76f1f224ecb00e8b31fed4143c0c6618abce18148c2bebe09fc2e26d8e0f2824
font_02_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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