Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89fac064e097af2…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 15:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3026cf8eea6ddb87e614ecc43a8e3c48 SHA-1: a4d2a6a8f1227a7c1cad41b044be45f765900c68 SHA-256: a89fac064e097af2bfffd9bbdb17c73d99b1762a5286c81f4c8d1a701ba9b85a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites and disposable hosting, indicating an attempt to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=guilt+and+shame+in+recovery PDF link annotation
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8cbb16068---50678330192.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073713a05f09---tuwubazepiba.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/15846068639.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16095936e146f9---tapugofabunitadaterew.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/biliw.pdfIn PDF document text
    • http://slsnn.ru/content/file/99370049655.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/tuxelasetesomuz.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b041a60eaad---bemuvexonoxoxi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/22702793967.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dc3e0bf8f---goleremijepuwumoguwa.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2fc69ed6---tapozijixepifiku.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/25928822103.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/23430219614.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/83n4depehkjfan20o082lj5mdk/pakesepabon.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4f1j0ab894p3b4usvor679684v/45989237304.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/82634965468.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/73578857343.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/wopenujamidadajorepotevox.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/544648795.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095eee7ae1c7---vozexesakipokizajugad.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/27809607620.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/zaleg.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081207c29bed---kasiraxazatasiwokesukor.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/suditep.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o9bb8eg9m2fcmi0c7irpnv3mk0/nadizevefikosenemagevumax.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_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16520 bytes
SHA-256: c14f574d523c01f39bf9d3ea9bdeecbc4928692130c4ffd0e3cdb403c632d72e
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 10952 bytes
SHA-256: 9bca8cfd2468a257f217af71bb124c245dfc792fdf7697e6578ec35a6da65d32

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