Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb760a0749f6c57…

MALICIOUS

PDF

98.6 KB Created: 2021-07-31 10:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 97f4a0a7807fc4d5701d184537ffd698 SHA-1: c83223b0737d7a41ad25084f071d7ac06b6ab68b SHA-256: 8fb760a0749f6c57ffba821d5cc793583c8dfedb29b6cd91b7d246bd8b0c30eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external links indicates a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://austria-ex.com/images/blog//file/32770950376.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609569c209ff5---nafegevewikofovukakuzorub.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/vurojir.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1ee5cd4dduak6me5nv2p4bj786/puwizu.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/sinozadosexopi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98b54bd35---8837548951.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25078cc0c---61107053699.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/zoxamefobusunurekupazo.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/gokud.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/86315f9ea7f0720343dbf08fbc4a563d/gazerawixa.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/36100366081.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lipetikunovonofujomabaxen.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-21/images/files/54844244585.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/pasasojesegiv.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050113011230.pdfIn PDF document text
    • https://starbox.fr/img/files/71067949089.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/papadamoxivanidujuw.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/kelalumuwenudafopefabowef.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa74566d1d---kawujukigegosidabefiramur.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/81995168645.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/08313fee58fd0e25f0dcc6b16b2afb37/sowepuwikitemegoguzifepo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16244864811588897324.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/bomadasaselixagezalevok.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/c1170c607f80c95c98068a5ce53fa4ee/42073146476.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m4bl4d9euop6fpvm0l9qgm2dpm/36314850958.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/47635487890.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a885bb0db---gazirawumomanigoxifogotol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ejercicios+de+conversion+de+fracciones+decimales+a+escritura+decimal+y+viceversaPDF 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_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 11032 bytes
SHA-256: 85f414ab0a33f161466b2f0a48c640192d9aa9c6af50e46b1b6727351d8460ab
font_01_sfnt_off000130e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FB 18908 bytes
SHA-256: b81890dcd21498c39952a2e61330916108d96732ba88e1926ee65897b212320d

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