Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3f703a831f8d15…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 20:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f75547afa49e6e6d3867979d3951c9b5 SHA-1: 36eae8d474015d58cdd779b27ebed06e432cb0a3 SHA-256: cf3f703a831f8d15956a0ea517024dedc28c43e7be74ca3b423fd5622255403a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, evidenced by numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=uae+map+pdf+download PDF link annotation
    • http://textingrights.com/userfiles/files/13729062750.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7503e6ebc8---16751935442.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b31c024db65---65020195898.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c241f358a21f107b302b8878051781e/pojizugikejidavisaj.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077339fe34fe---80386653058.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/sidaluz.pdfIn PDF document text
    • http://3sdent.com/upload/files/zitigamekiviximatu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495a5483c0---salalosem.pdfIn PDF document text
    • https://lasanisports.com/files/naxezotaxafezivibikuma.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/33bb2fc0264309865337bd7aa60f94e0/kufivibukijijuxabibowenef.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/44887497179.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/gozozatododazepafuwisu.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/47301088420.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/33351004168.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/netusasiz.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/kabezizadekujopusomexoxow.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/80406092095.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/sanive.pdfIn PDF document text
    • http://talleresjpg.es/img/file/36164803876.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3tu13th37dl6qu6h0ogalgbta6/90345551833.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/12785990431.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96b36005a---jogevolugirofaz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/wogusubotatagufivivukoki.pdfIn PDF document text
    • http://vodnik48.ru/content/file/jiwelabujuxikeboto.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/9118099786.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/bijamadadijekakaberoki.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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10292 bytes
SHA-256: 94c1d44394d0e79a7bd8e66f25dc7a147db5f784760473cf9d24f9b49ee52e2b
font_02_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 17916 bytes
SHA-256: ac3f9319cd2c9ce6f0ec68cdb800826b4a3964fbd26a4cca2026f3d49d0b0a35

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