Malicious PDF — malware analysis report

Static analysis result for SHA-256 48068a4a5f3fb2d8…

MALICIOUS

PDF

80.1 KB Created: 2021-08-21 09:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a63888b3c4f2c53934e56483e8f73fc3 SHA-1: ffc73a1285bd87d0220aa351709d297c423cc02a SHA-256: 48068a4a5f3fb2d84bc0d74c129619cac6d1dcbb5d8246ce9289b7107e73ee28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories, suggesting it's used to host or distribute further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/wubavedaxekoxebupoki.pdf In PDF document text
    • http://co-wemart.com/careeruserfiles/file/85811545018.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/rj6eaisa85qibs5tmljqf4hjil/xozisebenenijefepo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/37d9c865398ada14e995697681c9385b/72154814025.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35e4daa24f---81966799799.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/palogimilaxamodegaw.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5c85112d---36793633009.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/28725715893.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/zofiwonavediwesi.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/zufiziganofamebi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b9e5ca3db1eb6f712def40826cca9835/16774941510.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/xelinesaketujip.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/35761711178.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/6247062316.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/70617279114.pdfIn PDF document text
    • http://allycatering.com/userfiles/sutesokupegazutawapiwux.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/27346879028.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e37ebdb5ea8d873cb643b87e7726ffb1/92631648756.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eb1afbf14438016f41d303f7797a64b9/revegunazeredukixu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa56e09efd---biwinovubevot.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66801176786.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/dixonakarujulimavoj.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076e07574821---wurexotakixerajusumawafa.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f69be7e757f9502326a61932dfe0aab8/zilaniramurekazorib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apaharan+web+series+download+filmyhitPDF 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16892 bytes
SHA-256: 3185945c3b26d613f49ee609c2e7e6bf10edd1484bfc037d5db4b6694880b2eb
font_02_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 11084 bytes
SHA-256: 359d99fee5d9f893d3ae53b14891498524facdba92c72426e901162324554dc1