Malicious PDF — malware analysis report

Static analysis result for SHA-256 24eda19218c979cc…

MALICIOUS

PDF

89.8 KB Created: 2021-07-02 23:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78ddc7c35b735f79282b93b32504704a SHA-1: 14c9ba3a601b0a5e66497e82b0807753c6954655 SHA-256: 24eda19218c979cccd6867da5a62b44ea565e665ec9b19ef38ef52f66faf557a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. While no scripts were explicitly extracted, the nature of the links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a sophisticated attempt at obscuring the true destination and evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/438c40b4fb0232315476e4c53f013c99/zirurezezuwevewupideloxef.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf9299e00---pefuvezire.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/d319a19ecca6eeb1bf76c104c1e06a93/2473811857.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a40c8e87056c25df63443284d588a4c/10958128067.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/53278347236.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/679a2rsnrnapjdomg6i88981ae/48417045813.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bq5n61keujam4tpks3jco2on64/27964276491.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c95ce481c236d0abdb49e685d7028816/dapejulebidanemubuworadu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/k7d832fng39g0cid38flob84d0/23727873094.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/vomewote.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/adf2c25e24a3acbd3701cb959c1e76ad/41684499721.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/86537231428.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/33271934628.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c462f0f379b---36145744123.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607499a787fb6---17244441806.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b949b46e0ed---24972104444.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/27929151549.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090670662ac1---33303903218.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/nlc8q3pubse2uq6hphfmk0t1g5/19171740982.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/dae9651b8c7a6bc60b8e7816f34e00fc/58531795288.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/5eac8ab586401ea66688c4cc7bcb00e8/ponekuleguxasev.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/35642154a342295e5131ddb18b91396c/mokixuranowotugoj.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5375dab55f8acabd8e5599de7ef23d71/lomalerugobuzowupa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff79ee02cf---lenogujuzuwiwemolaxig.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/denalipugilegepebopilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=walled+states+waning+sovereignty+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_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 17824 bytes
SHA-256: b23bcf9ae4c5d2b10627bf0fa69dee7cfb0634aade3751062a001c09d67f023f
font_01_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 10932 bytes
SHA-256: ff50d4fb5fa2be45365b813a8921fdc56f44bd2ca0468c9bca5cc17ed4c27d11
font_02_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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