Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e4d508ce4407f2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 06:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5aa5de27d89385007c9b7e9e0a21f8b6 SHA-1: 9b173215a8ca7e6b0acc164685894130c231f4cd SHA-256: 75e4d508ce4407f2b102a3b3803274f2ee4f4db51559a1e4313b8b03f1c606bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The primary lure appears to be a fake 'download GTA 6 APK' link, indicating a social engineering tactic to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=download+gta+6+apk+obb PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141a7890b4a2---35008294682.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/59408961346.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/19625491872.pdfIn PDF document text
    • https://asi-filter.pl/files/file/53987201853.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/93053974445.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/kidazitedududipeg.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/fidifagevusunip.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/39961059125.pdfIn PDF document text
    • http://mayjack.com/upload/files/49400318249.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/gudidowi.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/bulevikoganubabirovez.pdfIn PDF document text
    • http://newworldss.com/uploads/file/gurobufelinisoxapurox.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/jelixadokopawesovi.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904073016.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/suzakidedikufuxuvuvebu.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/mumituxubudofabepigus.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/nozozurikuviwoke.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b8ed88e3---kobixuxapozimosa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/df8adca41888bf67a2738bebf2ad7896/lugewukedovofat.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/89162381426.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/liniwipex.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/59451426540.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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 17028 bytes
SHA-256: a0f8c22bf164b3887dd1c4d7d3ecca81a2629dc2a3530cf88af1700050cfe597
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 10560 bytes
SHA-256: 2e594d6e1642592bda9149657fc2b8283030cc6cb5acebbea508009aa3eafdbf