Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c78e0dee1824e3…

MALICIOUS

PDF

85.1 KB Created: 2021-07-26 05:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7836bcada2d11e82847b8d0b1ae6cbe1 SHA-1: 0bf5f57c7db470ec58c530478738499183cbe692 SHA-256: a2c78e0dee1824e37c398e5aeab77813bb67a614e853bd709b0cc61a5210c703
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a malicious payload or phishing page. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/vkej3c84g0g1i1sni8aq93r700/51910110420.pdf In PDF document text
    • http://omgmediatank.com/userfiles/files/toxatinerasowe.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05be2d891---bugavebamijakoxufisiloron.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/65355211981.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d17ffa0b5ba6fc5618b9c8be93226756/bufedimusew.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bamutelopufudew.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160797a4cb00b2---voruxewasewidexik.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/monawuvubewut.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdffd7727f---gujamanazuxejus.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/pifizidadazutamumozoz.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/61bd80c5a4cf8a90ced8610770890540/84387390561.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/33535975038.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160aab9a387562---54478420181.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/obehmp0d237ssbcufhk42o51nh/46700180088.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3428d1932b---81289611018.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a484f02b7---wogopapabazipozabokagun.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/mugufuvomefalun.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483a66714a---magosirudaxutoxuruj.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/8gqkesc9sm9tn5v4vc5i4brura/68880743178.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tanel.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871d81e1610---fidigugusapobu.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/gulamovazudoforewibote.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2182c73ffa0a7a7af3ae32af88039e10/vedewo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f33ab8dd8---xovafimajesowila.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/58314752913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=june+marieezy+fly+letra+espa%C3%B1olPDF 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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 17820 bytes
SHA-256: 978c5c3cbe8d18c27d2a55a175415ce19a17d57e0265250190ea3c63e8c77196
font_01_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 10988 bytes
SHA-256: 0eaa443a5f9a5ad723e4b118276698477aaaf743945249531f644b4ec9452114
font_02_sfnt_off00012bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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