Malicious PDF — malware analysis report

Static analysis result for SHA-256 77563cc7b6169a73…

MALICIOUS

PDF

90.1 KB Created: 2021-06-25 20:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bde209329f2f8334c300f07e5d2baeb9 SHA-1: c2c996999c30c7ebb5da4e688c5843e0f3011bc4 SHA-256: 77563cc7b6169a73533363f613d2b73806d7452e87b4da6b9d33b500ab197632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=bank+of+india+share+price+52+week+high+low PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/49f9f91d2c6e8011fa1b663137fc8690/xefaf.pdfIn PDF document text
    • https://spacio.hk/attachment/file/vekovalo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/09l0s4dj9tvn0i1m27f8knq7dg/71769425260.pdfIn PDF document text
    • http://mextro.de/upload/files/81836809835.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/11ec32d9cdbf522cdb9761d846d207c6/mexilejisevibizijel.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/29/file/20210529_015722_139.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8484c3d0062b20ae5a811dda13fbe33b/77744271207.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544368ed2b---51534582732.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/4b31d831ac8c55a84b1e8e297ce29a4c/83093634712.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/fitifuworef.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1d5234bd---letuwowisabufevo.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/febabagoreloxepijuwodude.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b4c0505be6df467c38c185fc072b1c36/12226447263.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/viwupix.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5eebf1da---31522369680.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/18598224273.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097aa96a21b6---90933950026.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/8904853653.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f23cb67d28cfc436308bea48ec833cf1/41014350514.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a77cdc7cb75---34262926255.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0aa1fb8596dca8ce92325a9d7b89a108/37783469091.pdfIn PDF document text
    • http://charivne.info/images/file/fijavabotejuzomanoje.pdfIn PDF document text
    • https://aashianarealty.com/file/bubuw.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/ruxawubokidizezojija.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16077202fa363f---rubifolematuxolusiku.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/4lk3vkp7er9emlrflkk86vip35/wasunibifuzuzekowu.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_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 11284 bytes
SHA-256: 9b9ca8ebc2e4a699efdd01cf956f655140cc90fb0bb18eb28215fb3d293ee0e1
font_02_sfnt_off00012a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A22 18616 bytes
SHA-256: 8bd6e5d4d2ca9145283f0f9e3cbc23799ae0e79a6ca6ccfa4961492a5ec48fd9