Malicious PDF — malware analysis report

Static analysis result for SHA-256 965a23814ae761bc…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 06:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1807b71f14ea5c793909c57f9a4f7b5b SHA-1: b8f1af2ecd6e91f00cda887eb2461f8958800ece SHA-256: 965a23814ae761bc5d57a080ca789452b075f5b84aec8d4cd29111aefc46e869
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://nomylo.ru/uplcv?utm_term=switch+button+kotlin PDF link annotation
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/27611503885.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/zajopedumulawisizaxot.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/88200867803.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/11493892281.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/17229319037.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fekobojaluvedewapugexej.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/95866608961.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/70121350243.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/89106865370.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/gavulezofizegafoxudofivu.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/togorilegavufalutuvumo.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/44162221943.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/66mbao29tg3mefagb5es7n682i/67905063633.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161356c060ca11---sanule.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/88385502404.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f6587b179634971abfa292f9ae40b59f/51851153229.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/jukogowanodigekimavaru.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613718067aef0---74679458238.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/niporeligi.pdfIn PDF document text
    • https://andana.us/files/files/fejosetexosagawobodid.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/3915746493.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/luwevalilegefatelulaza.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612f0771cd239---vanolofejikidi.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/bafuwakepuza.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11948301232.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/fiwokabisag.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_off0000b9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AC 17164 bytes
SHA-256: e8e2e843c55be8520ba796b06e7081ad2f1e756435b13f8c992471b63fdfd5fa
font_01_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 10260 bytes
SHA-256: 609243277977a5d81d5f60c38ab73fca342240089360a7af2b8c61a37646751a

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