Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfbe08b4408df64…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 09:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4611c007fc749584f99b931dc85e132a SHA-1: 3911ab7b5b736068550693b93ac83bd8ed73239f SHA-256: 3bfbe08b4408df64780528cb25e65159653a019c877a223e994100e199e943f9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1553.005 Security Software Supply Chain Compromise

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to deliver a secondary payload or redirect users to malicious sites. The document also contains instructions to disable security software, a critical indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://gutachterbewertung.de/userfiles/file/17226306636.pdf In PDF document text
    • http://z-him.ru/userfiles/file/67071743181.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/kosupanisakirapuridapapi.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/92822392654.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/102914086.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f131442b3a36e5a479900aa950a266bf/18053467972.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/37691222493.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///muxowuperovuzovujejilo.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/ladegulawafekosifitekalo.pdfIn PDF document text
    • http://grafitym.kz/files/file/bitemiferibasedu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614022bf1b90b---vulibebi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33b1d9a6d---40863335272.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/vigolumepubijef.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/48427209038.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/jojenalizidetonafewar.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/45945930635.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/bizidukotobu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/tosexapagivivetemokati.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/pedukaxemexefuzi.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/rugexavizin.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/senesixinipasawupajono.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/ronarowijaperima.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/domadogidapipadaxomawixu.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/livulivufopororaba.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fasusexemidarepij.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b79bfc042b---22073988944.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/2991448843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mtk+frp+tool+fastboot+modePDF 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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 20612 bytes
SHA-256: 9bc2518230dfece0b91a94e6de591468ed5b03dd62f5f9a45de86329712a926d
font_01_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 10688 bytes
SHA-256: 6f35e334dfd25961142731f8a63803f590106320c5678ed4fa3557810031603b
font_02_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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