Malicious PDF — malware analysis report

Static analysis result for SHA-256 db162f1a0a188b5f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 05:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 573d125a8707652841a9602c791963e1 SHA-1: 9b974e1d387ca780e2b7cfe7e7352b6b9e0c16fc SHA-256: db162f1a0a188b5f25a7042ffb4ed8b4f7420eb07f533a0f8505444aaec7538e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to deliver phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=osteosarcoma+definition+pdf PDF link annotation
    • https://xyoaa.org/sites/default/files/files/31865973449.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210628042754.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m43ma0ao19i20a8e1ehbt8fd02/jefilawifuvupanerinibuw.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cf15d028d0a549862141cbbb1502cf74/39329447962.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9a99f6021db88e83bb8803041b02ec33/gotavawedo.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/93395720207.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/n08jpakao8nuadujcokl50jn3r/rosizifa.pdfIn PDF document text
    • http://novena99.com/uploads/files/202108172255135494.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/43117339526.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/pawupawunoxaponanoturux.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/73168370432.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/dudunemojosesesimaxawoxi.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/61776751988.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/11405840808.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/wuduviruwixusowo.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wajom.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8298dafb3---44683380204.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/5103991950.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0ee4adf2---90256325364.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160767b068273d---7290090966.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b946f271e9f612d995e29cc2c4641c09/pulobujuxusomigipa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6af767ae903dc92fec47e1a01f332bdc/jevogawoxuzovasemo.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/41339648172.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/44da928e6d76417dba2df887fa60f518/63255644101.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_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 17060 bytes
SHA-256: ccb6a9543aef52b5a7046e0705c819d98f8ef8742a64287cde740d9a8d85688f
font_01_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 10760 bytes
SHA-256: 337d44c636cf8a3de56a7d3fed382b4809dbbf839396d04560e021ff588289fd
font_02_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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