Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee9ff1db9985f07…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 20:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4683be7b0bfd83e74789904b026cc11 SHA-1: 9c4bc324565bbb0a15bde894d57d0ec8384dbb02 SHA-256: 0ee9ff1db9985f072b46be5b6360abce243756adef720dac8493eb2d4907af33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing operation. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drhuanghair.com/uploads/files/202109010756541174.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fs7fhn5vjho7ihh62ism0uuidf/kurojekejosol.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/80569224583.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/12220857420.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/zojituxajonilekoxuw.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/kubadav.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/91169067605.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/17296534282.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jeradasu.pdfIn PDF document text
    • http://orthodoxnews.us/file/27699233794.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/20266982856.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/demobusimo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0581a8a3---mirivubuxilekiwoba.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/tasadanenekopuxaw.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/42675224812.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/fexarigomolafoxidasufaxo.pdfIn PDF document text
    • https://badoza.net/userfiles/file/35309268104.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/sakenusu.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/14319780790.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/27833878566.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/bodiwilizote.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a44e91fbb---titaxufonatanatomigo.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/gesubaferusesijumatawaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=clinometer+pro+apkPDF 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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 18244 bytes
SHA-256: 6d42a838465f8867e400612f38e317a5b957fb8820574697fcab9881c494bc4d
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 10368 bytes
SHA-256: 579d904bf1195bce4719d99a0baf4b93582d172b545f4ce76fec528088e7478b
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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