Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4097415dd51112…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 21:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 881df4af01f60f01cd921543915da89b SHA-1: daec4899f569069b107de21067f8bde804dd963c SHA-256: 2c4097415dd51112f1edfaf3a0e28ad39e812cd1e20d31f83db0a5f98bba35f0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and link farms points towards a tactic of redirecting users to malicious destinations.

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c30301ffe---pekesisixesevijufotikesag.pdf In PDF document text
    • https://grafconsulting.pl/Upload/file/nevisubopipax.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/72831062063.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/87589256422.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152ce163c3f---rabafiwijunesut.pdfIn PDF document text
    • http://ruresept.ru/files/file/30236309652.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/16313156200.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/temak.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r08joikkvuodsta5d37cge3314/garazixafovunepotadiwub.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/bixeputiwik.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610587d44d4eb---40013271094.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wodowoka.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf6e0f1470---2343650240.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2dfc7af5db6375f2a7123068a48badfe/tuziwetesipowok.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/mebejukivagekenun.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e18b0ab3b94e6bdd10b3e3332e303fb2/tawevafogepuzokuxiwunibak.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c13c5c954d---34369243643.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/3506195342.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f32081116---xojufogikovomarexexamuz.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/13677525618.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/jibiboj.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f7d93266---bekikamiruf.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/97c6f38cc8a812b79f22c14e113bd3e1/30163790940.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a0b8ea28f83896c4072697bc5d3bde29/nukuvirowav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ancient+greek+religion+a+sourcebook+pdfPDF 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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 11108 bytes
SHA-256: 0e01548ff8208eef58fc3a8574aee577ab4d96b749fe8e7650b019444ec5c32d
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 20276 bytes
SHA-256: f8dce661d4f6d6ede06cafb78537b95c7a4d69290658a8291ae633e5ca2f0f8f
font_02_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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