Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c4b35d902ce1d5…

MALICIOUS

PDF

93.2 KB Created: 2021-07-14 01:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b91f84ac91baef7bf2168586aed9405 SHA-1: eb663388a39debde63f4e1ffdd0fd8d081545e66 SHA-256: 83c4b35d902ce1d5d75f3316afc0cf01aee72995f9c87f4186f74f2d5c2f1fcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm hosted on compromised CMS uploads and disposable hosting. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and numerous external links suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=checkra1n+for+iphone+xs PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e92b38497---wejixe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/79bb749f44dc2877879927b598212f25/nomepag.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/perewiwupegixatojibur.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/33014038813.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/pedene.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49f34dfcfc---lawevepusesixepirakexu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f7e6ef3b9d755319b56e8505c052c4d8/42187912817.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/12372584966.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c215d2d1b---69615452110.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/50303813674.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160749b9862da8---71466463060.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/velugutulu.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/gakajujigogemuk.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/259d33r9llb213969r4p3t90vc/39328786433.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/05tb97ekbct4o46iuc0go5d9f0/73861193629.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160766066dfe78---govotirizigorexarilaviki.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/tawijinaxa.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/847qqet1i9l3e8g8s70f868uc2/zedirodepiduloxirulunuri.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/dtksqm3t24666e6p3dh8l405p9/larakaf.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ms66ta8lgmmsdiehdcghf1b4u1/sulevawubazidokowadibezil.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b777b0207c---xexajeliloponenupeborowul.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2i091h1elk0kntds2od0q8sjs9/gupuzezexivifolawitema.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2721270102a8c57747dbc92cbc67a902/velujajomimupomun.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_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 10708 bytes
SHA-256: 2bf0d123c84ce78f41976baa64d8b3b544e4e6909ed02c90e45a0cadc0d61402
font_02_sfnt_off0001369a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369A 18300 bytes
SHA-256: f19f8d64fd80c8acc8b4942f9ffd47037767e1ce40b126e6e29b5f62a5d22dce

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