Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d5a668ea030709…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 04:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 352da74c52a9689caa6cd40986761316 SHA-1: 246a95f1ef3d82b6ceddd28a9eacc3dfee2f56e5 SHA-256: 34d5a668ea03070955617e6f4bfd9d646b5e51c107ff6620ceb74e81a0243c9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ashole.hu/UserFiles/File/kavakaridu.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/ledavovakeg.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a170e5606---63065605125.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091221304273499.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/5224543125.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109030956112245.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/xugegabodekovubu.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/wulomobax.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/22268841346.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/zejurajiluwolana.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/zibilesexapogonafuzufinis.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/mujuj.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/fuzaroleniwun.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/wirudirew.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/18038015706.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///41100608985.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/dalexokixadaxamumagumam.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/12535532581.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/27134279262.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359ed36e5a7---zojogu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d678761b6a---zexubipazata.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/mupudof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=remove+device+administrator+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_off0000b0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F2 15404 bytes
SHA-256: a9d38813bd9a2f8555043d171e1bef04287a0593767d2f6034cb496f609da12e
font_01_sfnt_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 10596 bytes
SHA-256: 35db0a0a49183f0458d2be1dd52f455a2769a84ddec17c1c7f576746b8b166aa
font_02_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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