Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f8ba5b429d9cea…

MALICIOUS

PDF

78.3 KB Created: 2021-09-28 01:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 856ab8b453f29f33d64c3b37d6b51406 SHA-1: 762eb6505077752252c5b1077640c8dc580d44df SHA-256: 10f8ba5b429d9cea842d7c97b809f714a8906cd33d057f55ab5a7eb1ac0c5f38
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The 'Remote-support tool lure' heuristic strongly suggests the document's intent is to trick the user into installing or running remote access software, likely for malicious purposes. No scripts were extracted, but the overall structure and heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://gdlejia.com/uploadfile/files/20210922_234307.pdf In PDF document text
    • http://liily.jp/upload/file/20210920164910.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d03ad7f81---71682342530.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/23974419925.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/pelivisopafuguwozumipe.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/79840369324.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/77018576579.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb8ff2bb15---pixonavunidon.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/82021338853.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/panivuton.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/mibavasiwufevuta.pdfIn PDF document text
    • http://www.bash.cl/media/file/veruwut.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f492f9c9aafbf37c341ba7d968d39b3/10738737110.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/kufepififubo.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/8882008460.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gvctvm28p9e7l53pilup8778ir/69190866988.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/kiwuzadex.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/vuwudu.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/sobudomawapiz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ef951f3b5ae385e1d0b94b9eb97caabc/38035048117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+na+telefon+pobierzPDF 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_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 17104 bytes
SHA-256: 52e0249e376f403ec0604e77a5b6605418d1c461f22bf91588a497eec7cf6482
font_02_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 10504 bytes
SHA-256: 6b050934eee448ee03182a43e3d3245ff531d6db89b6bff28b06d10331d60b8a

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