Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e818f977ec21ee…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 17:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfb75fc593ce54fdd75fc86a17888cc2 SHA-1: 82fc32b6c8784c709d5006ba92aaf3dd02cb7a20 SHA-256: 24e818f977ec21ee9f52aba68fe66fab2c365d5339f315323126725da83095a2
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially to download further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://computer-rudolstadt.de/upload/file/23692194539.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079803ab4a53---gudopu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fdf5b45a6ebbf00b9dc6711f016bc7bc/17450341130.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/09be7c90cd7bda9aa96e2deccb6214e8/73569107980.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/vafobusukepek.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/poviwotabapu.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/79162621144.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/74964055882.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1cb028bc8546d0daf1526c58c7208917/sopinafunowiko.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/towoliriwosogijufutew.pdfIn PDF document text
    • https://premiersuli.hu/files/files/kexogagagenoxafanifal.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c51f87686---45524131614.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/19480012900.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4a244c5935d2fe942355fa1710d4c5d9/gizuzutazim.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/87383808478.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/tiloniledakoxowilef.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cb2228b1---98978910903.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/835f49dcf0054bc953c44eb75b4c8f7d/19473540629.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ccb4e9ae---8743949095.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/sijepifamekarupoxamerikeb.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/zunupefibu.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/pagurezu.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/97323922668.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/pebax.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/tumajiva.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/9921537996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=microsoft+excel+2007+tutorial+pdf+in+tamilPDF 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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 11268 bytes
SHA-256: 84b5a8e56d82d08471b3345ee06cc693d2939161bf0a7c666accfa92cd14ace8
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 19860 bytes
SHA-256: 377d2e82fb6dc7c51fd2f693a1b4ac336380f41b387052ff3f10c1d18ef80007
font_02_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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