Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e31053b0f60e34…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 07:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ccf2600f73e5a8c9be2ed90d771ba89 SHA-1: 2a5009b27225d490ccbbec7afddfe493076c5cec SHA-256: b4e31053b0f60e3472fd836e3482f448f97287c15bc0fe98b9f09fe39d5c1da0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://crysiq.ru/uplcv?utm_term=wuthering+heights+by+emily+bront%C3%AB+pdf PDF link annotation
    • http://themetamorphoseprogram.com/userfiles/file/31993425359.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/34642038254.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a147478fb1f---woveg.pdfIn PDF document text
    • https://digireg.it/upload/magoxenawuk.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f376b77f0a---raduvimerewawaduvadavuw.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ac5602ff304917daf2c15b121c9a949f/moxiwodim.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e77a2f72---80948080629.pdfIn PDF document text
    • http://jsdarvin.com/files/6706987219.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/q369v46bgpjntk91e6kuucqe0m/63154101043.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/wumemogunifowuvipiso.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/bupovozeviwusividorugob.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160783d8323fb5---97492390843.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/ponaxewa.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98e2904e8---44143187296.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/32210450624.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/26234043984.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/30907676992.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d012c51a5e840ec440286040bc0118a/75634143004.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kilibugiborupebuzig.pdfIn PDF document text
    • http://kfbi.ru/content/file/wijijovonuvebagelu.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/lodanolusisa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a79f1d15---vazovotirifa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6e80c7b3d6ba8320c5ed3d8f9c95b1b4/61543626895.pdfIn PDF document text
    • https://baptistfriends.org/media/93562657538.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/jozudimuforavasezujerife.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/xedorakowasedirevo.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/13675665363.pdfIn PDF document text
    • 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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 17572 bytes
SHA-256: 1a8643d9013446561701c19138465ce5ec0a017e07cde672d2671057f214e20e
font_01_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D41 11356 bytes
SHA-256: 70d6f17da289a769c566318f97a363393c8541854fd01087090001bf5ad506fd

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