Malicious PDF — malware analysis report

Static analysis result for SHA-256 507bc1b987239414…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 17:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9db09a14f68b434d9d0059edbd70fbf6 SHA-1: 387898618426c1ecc5e73e17243768f8acace62e SHA-256: 507bc1b9872394145c60e187fc4ea791c04ec6540c5d0b2e3b656a2636e60ea3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to leverage search engine optimization for malicious redirection. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://garglob.ru/uplcv?utm_term=column+subtraction+borrowing+worksheets PDF link annotation
    • http://yksskj.com/ckfinder/userfiles/files/semeladekobefamakowixuk.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/gigorujimuboweder.pdfIn PDF document text
    • http://kelsenator.com/userimages/81553046863.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132214791a35---zarisupiso.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/22446730481.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/fiwemowagojomoro.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/64806029590.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec60333c2---89793775698.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/revidedupevizixinef.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/56684137064.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/nifozerefogugu.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/dafolurewofudogunedofu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100ae001d6---bokidudaxitowekekezas.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210907091659.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/suzefivileluz.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/budelopupajo.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/91119471540.pdfIn PDF document text
    • https://agermag.ro/mm/file/69969969702.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/93342007926.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/25201433612.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/53123524026.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/sorafawuv.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/wilojuribiferatadu.pdfIn PDF document text
    • 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_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 16532 bytes
SHA-256: 464e09c5322dc974cb79027da1ddcb9afef8d8fb5739e602ab9c240d2d8adbc3
font_01_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 11128 bytes
SHA-256: c9a547b57b492dbdc1098ba4722fe83d7e1a605bdfcdf9f1aeca4d6815781f40

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