Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c6947f1ca15e23…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 13:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e192d15cea885c7aef66f3e9b6567146 SHA-1: 62f820e202abc2654d4a0a13dec6adf4f0c57101 SHA-256: e6c6947f1ca15e23a07eef617d71ce7ac1911228f4bd40c4b014a33ad6c4536f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://viethanit.vn/hinhanh/file/66542232189.pdf In PDF document text
    • http://zatoodesign.com/userfiles/files/xunonoruwunavutuxawobuwa.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xisoxezuwujusas.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e129d97e---tomevodomizakujilokaned.pdfIn PDF document text
    • http://nktrading.qa/file/files/17328844755.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/gekusow.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/11312532625.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m7c1pltnov2ro8nfs0l2lrqrev/14281114094.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vapuwowepunowe.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/97831270433.pdfIn PDF document text
    • http://denge.aero/upload/files/vewakudo.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/70784819504.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67954892c---92996559281.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zubilivunirixamud.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/54524705122.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136432133a9a---86966171362.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16144bffccf254---92293852530.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/6369719192.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/fuponidezenasesifezo.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/fusadanexekemu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/25627207021.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/5905682712.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wixan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=heroes+5+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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 10224 bytes
SHA-256: de35b1ad340b53033d57a04bbf3b2a13c81f9c113282a5b23dc1fd5313be0a33
font_01_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 17396 bytes
SHA-256: 49cce1fd5a4985253456e4052f98d267c227cc7c11cecef05d6d66b51f9c502c
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1