Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd95743d2c57bc8…

MALICIOUS

PDF

70.4 KB Created: 2021-08-31 23:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 632119736a784464f59e60b88b0b63fb SHA-1: 720dc0bab6cf9245321bd9ff4c3515f4169c73b1 SHA-256: cdd95743d2c57bc8312a1bf149e892c7200558f07f53f2f62f3632d05834a17d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and small size, typical of screenshot lures. It contains numerous links, many pointing to compromised CMS uploads, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/65bea61fdab6aeb18438fb9e51091c54/44236750350.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083089d1bb66---52065683450.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vdvb95hb2tcmp3brcs59m33mc3/36136948585.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/29b015479f45347a1d6ad4816564579c/38984414372.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/vupozixudinalepotesezipe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/05c1544ae2164567c34a69bb4ff2f75e/dubarusixerajir.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379a233032---92037383567.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/18323459757.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/nolupusepuke.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/vuzetigi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99382bd704---lagedoju.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/2444955723.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/44836683474.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vutes.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/28037705235.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ao8qhou7jo95vb27u0e0g9mmu9/94363468478.pdfIn PDF document text
    • http://texmet.pl/userimages/file/8374506744.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/fevejebeke.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mejinozed.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/wexetelo.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/dolomiwisojoburetulujuxim.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/io038plu955dt4ohig618vo338/leginizita.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8b9a21a4cc60c03f4cc9aea2f11589dd/vokuvodarumod.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/pimojukuf.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/lk8n3t153jp907ag76r6qeh52o/xawubasalagugifulim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+gta+5+online+for+android+full+apk+freePDF link annotation
    • 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_off0000b6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A8 14060 bytes
SHA-256: 2041354c3bf1b5b0b83cd6b68491c3b9938441e7d8fef3323837f367caeb9a6e
font_01_sfnt_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 10916 bytes
SHA-256: 4a8f8e5c58aef110d8e36e9e75bfd0253883ba5958be24295dfd1c6f32eb7c4b
font_02_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1