Malicious PDF — malware analysis report

Static analysis result for SHA-256 0104e70095056858…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 23:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e978f9b68c16c3813fcf2c6e7db5caca SHA-1: c89e7e2f36a375c7a5c48db0aa7c2e4b43d87c5c SHA-256: 0104e700950568589efe12493ce2b98a56ec8789988e79ccf7e7f4c96dde95a7
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, suggesting it is part of a phishing or malware distribution campaign. The 'Browser extension / update installation lure' heuristic indicates the document's content is designed to trick the user into downloading and executing malicious software. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://karpzbeldowa.pl/uploads/userfiles/files/52199160820.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132f48692a9b---jawobabezumarepupo.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/38273482231.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xorusamibukanivuzimi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/abf25b5320bb17fbb435dd9498267489/54083355540.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/memizebafalibalisu.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/65883359804.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b497225e3---4836387701.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c32cea86---xesezijezomi.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/24977135270.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/fokuwolebotijeboguv.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/56357918144.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/pivilagatobixola.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f0e13a4443a93302d8fa3f2413f9d7f2/18415596004.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8fe7d615eda73a76d010b76e5183a6a6/dujimiwulotezowujikizob.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/8839008610.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/vadabilubiboruxuro.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8a48cd0b320c9d6c774605eb00fa85e0/mefufosiwijewozidufev.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210913030815.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/27949547458.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/pizojubosur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=insta+story+saverPDF 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_off0000c096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC096 10096 bytes
SHA-256: 519e349d3d8809a91a6c9369818d5a370f366b93ee6c7258ecf755a089f09acf
font_01_sfnt_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 17836 bytes
SHA-256: 58cbdcd3287e35e78c972341370412ed063e538d41407e7fed338a0683543331
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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