Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c927b3b6676d8a…

MALICIOUS

PDF

93.7 KB Created: 2021-09-13 23:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ef6b9cd28715852e614759531022e33 SHA-1: c30cbe4369b5bac62b7e62876dfbd08e06ff6ff2 SHA-256: d3c927b3b6676d8a7a8d37bc58c0311890a832dbde3773371c9822a0859de203
204 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript and numerous links, many of which point to potentially compromised websites or disposable hosting. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to provide a password, suggesting it's a lure to decrypt a second-stage payload. The embedded JavaScript further supports malicious intent, likely for downloading and executing additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.eos.org.eg/ckfinder/userfiles/files/salukodemod.pdf In PDF document text
    • http://isystem.hu/userfiles/file/pujuv.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/39207530817.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/73324585337.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/1600834544.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161324c451d693---wujiweza.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389aaf4a3e4---xogolorupup.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/27483378281.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132116768856---leguzi.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/19583721248.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322d77c1f6f---pekuxaxez.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133dedf19744---wevuwexawidumujapexow.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/27062165644.pdfIn PDF document text
    • http://crediramasrl.it/public/file/jefabifulasaw.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/29774499960.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/55973485652.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/54215541848.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/bojudeteledata.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/wodibajowuzimisanoko.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/89217426368.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/53519526175.pdfIn PDF document text
    • https://mangallagn.com/images/file/punomuxisizejaruwetosi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zawuxorelorixedifiji.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/6133514048.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/givetefetibomosoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+fortnite+account+mobilePDF 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_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 10548 bytes
SHA-256: ebe14abed332afed0ef2032bebe5980c58f152595df56d39bc35df79c1a0e46e
font_01_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 19124 bytes
SHA-256: 836884c276f296428f9509f33d7bae43475a0ef7de24d49a6ebaec25115e9313
font_02_sfnt_off000150f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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