Malicious PDF — malware analysis report

Static analysis result for SHA-256 5477988c4a289cfa…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 00:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05ae3346fc250cc293ecdd42e28a7506 SHA-1: 611ac3cf8b0927cef8b60583377df5198e28792b SHA-256: 5477988c4a289cfaaef78decffce717d6ae0bdcde77b5183f6a74e943143f008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains. The primary purpose appears to be distributing malicious content or conducting phishing attacks through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=the+conservationist+nadine+gordimer+pdf PDF link annotation
    • https://kueapem.com/contents//files/fanesofuxezosokuvezumoluk.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/xefako.pdfIn PDF document text
    • https://cargotavio.ru/files/file/93907407793.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/bejabopovulokebogexawuzi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983fdaa06e8---zezatipinawe.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/22803366530.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/399d70e799790ed44896b1ff857de151/70638197865.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/63ff9037f14a5dd46c1328eb0c329c4e/weletitedatuxusepodumoxe.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/11501915171.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc1648cc7---povivid.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/32582431187.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/dakawil.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/fufisusajotijatafusiz.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/defazagikisitad.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b6bc3d21---44200651271.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ropaqpkj23pr04dvhd98fim5m6/tisepabubali.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/nijuxopokogavamapavon.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bb811f29a8237445a542396850a6f291/15109427142.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/83347498798.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/dugesopamiji.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/50637699649.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/57147541350.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6e34c74f6---tirekodadedosek.pdfIn PDF document text
    • http://puisan.ru/uploads/file/19847205897.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/95296955409.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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 11048 bytes
SHA-256: eec15e7e364d46f2cbb71eccae77be34d0c41160ab796071a799a120e5b0b195
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 17044 bytes
SHA-256: b8a0fe1fd803db38ff85505fd0ac5df7ab533f015016b5e5203aea8b79dc5405
font_02_sfnt_off0001247e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1