Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8649900c914f9e6…

MALICIOUS

PDF

94.3 KB Created: 2021-07-08 03:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d7966ca474c48d0d655b483d3ca6c0d SHA-1: 5cc47792c9a4cc45583a16a7e610e7fd2dcddef3 SHA-256: c8649900c914f9e6a330c2f622160efc6c3707a57652a21babc1c8c9ffdd907d
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 embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it is used as a link farm to distribute malicious content or conduct phishing attacks. The presence of these links and the overall structure indicate a likely attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=on+a+clear+day+song+lyrics PDF link annotation
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9fd1ajrd06ng76trmp0t1l5end/sasolejopav.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c687edf81---90417615163.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/22905713742.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6843456ad785efa5eeda6b6506ead700/79876145820.pdfIn PDF document text
    • http://abpaluso.com/upload/file/mufaxugakamitudevobepif.pdfIn PDF document text
    • http://atek-ent.com/upload/file/visepukopirofukitivike.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11bbcee24---97895273027.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1a1ef024---xaxararafizorenum.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/p1eifraen97n7gldf0udbp5tub/jonuvokalivejomesurozi.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/gijur.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/poleruxizasu.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/kulegiwuzovat.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3pds2kd5dp8s61qtdua3ode1h1/dixufe.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o40t79trm91d825th97v8flmje/15832287809.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/62173593955.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df014aa9bd---lidutaparaxibumev.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/47519807360.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/227901b801621dd4625ef18f62769a62/guxatukunuzoluxudazoratad.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/07276fa17172d6e7b42f89129a0b243d/ralokamemejebebokodagidu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/19316691302.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7c165f74---52152330564.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1290b91aa---guzopotujomolijodubebo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07cdbee769---59757278556.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5tuldc6cjodiuggm2dol33l7hm/tusijosikabineto.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_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 10584 bytes
SHA-256: c66f1652fad16dc85fd1811b83dd777e5f0b713872ed2caa83ae34276a1d4ece
font_02_sfnt_off00014079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14079 16916 bytes
SHA-256: 80e2e525dbbaad1d5081ca559ccaede180886c26b165bdab0e8b764d704288c4

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