Malicious PDF — malware analysis report

Static analysis result for SHA-256 6291c4ca0c9f031d…

MALICIOUS

PDF

74.5 KB Created: 2021-08-06 20:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: abffbd7eeb9597cca36eef26015995b9 SHA-1: 5ec347b5cb763b61e9a72dc9b1a4cdec1faea3d5 SHA-256: 6291c4ca0c9f031db267e67d1d339e54e092b626ac6145ea7e3da042af362651
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The presence of embedded JavaScript and numerous external links strongly suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/vedakupet.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cf3cc689---12328303836.pdfIn PDF document text
    • http://unsersohn.ch/images/file/dodixoxupufibomuvafuz.pdfIn PDF document text
    • https://ntc-container.com/upload/files/30184592037.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2177f609451af090c9d3c24255b537dd/51000380174.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/32792159679.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00dc2591a---66436111483.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/13ea1687ab0968571da9558c7eb1594b/27178974639.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/73407498519.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/4cc52021df301b36c33b534b85fddfe2/risufezotelevomuwodo.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fepivugexepafujiduxajo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zavopubepiropapuma.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/mubizunin.pdfIn PDF document text
    • https://triosms.com/userfiles/file/71186648181.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b063e770---rawenatesafuxagasudujo.pdfIn PDF document text
    • http://fabtur.ru/upload/files/govirevamunepapa.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a81e361c7---14182974451.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/15193555711.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/kunon.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/11847836215.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf94fc21b5---vosodosamawaruboxab.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d0befa4b---6272566881.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63521053937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=blade+and+soul+lyn+hair+modPDF 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_off0000bb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9E 10684 bytes
SHA-256: a376b4b8fc305c3e817900f9e2f433da73a5aabd9e6eac7499a808fbca434235
font_01_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 19668 bytes
SHA-256: d6c43d8fe5ce49a86fabbfd7210894ccab73431e26ab31b068b0d8b9c4aa4b72
font_02_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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