Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e0ad9c859b2abf…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 13:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4e74ada472b164922c5c381ed76afcce SHA-1: b4b84dd8e22de2df4da9551d911a8c3f874a7836 SHA-256: 28e0ad9c859b2abf41f659be46cee0003a64c73449f358d938510a2078e4c974
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://cructi.ru/uplcv?utm_term=patch+obb+pes+2021+mobile PDF link annotation
    • http://1careglobal.com/upload/files/jifuginojosi.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/lufufinisibexijurepozem.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b677787e77aad032564a2c787f90c134/sevaxaxibigidijidiweledu.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/93486878461.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e3f45e52---64385875385.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/totimidezejuzupokemu.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/lifumujanobeduf.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/mofiwefanazabamo.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wuluzonuzike.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/20805609965.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/fedipomudixedepobavijid.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/siteniritinisiderobuvev.pdfIn PDF document text
    • http://ashioke.com/images/library/File/wupimar.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/70574024372.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/49846e57edd7591156d1f0385bec819a/94469285455.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/kimebuwunopozox.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/vogamit.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/bumixavomaxaxevezoludozi.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/11409306786.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/2345942068.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/vuvobifatatig.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/judasubogaw.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/gobidupuwutesewezo.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/40469206079.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rodorimuduzoluvulujit.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/ginalik.pdfIn PDF document text
    • http://topflexsports.com/uploads/38347275752.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_off0000b279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB279 10872 bytes
SHA-256: 30b9960e4be140ec8c598871289535e49f36634711c01abb4f60e8b5dd4a41e8
font_01_sfnt_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 14768 bytes
SHA-256: a106c5cfc5b8e47949b78ed684a76414ba9d60b9eff9e517abc045e4fc66b66a
font_02_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1