Malicious PDF — malware analysis report

Static analysis result for SHA-256 50edb077a950af61…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 23:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f600bd1ec56a5d261edc6c99c0e43c82 SHA-1: 4625be37484fcaa941c798723c569c57fe8642c7 SHA-256: 50edb077a950af61ed2b3aacafd1e5967aa2b5bed8179955c70fb55f5dbd75f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=pokemon+go+free+pokemon PDF link annotation
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce553cfc6---86710267520.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202194203515662.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/57255633966.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/38801750211.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/91654312266.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/36418599659.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/farupatonapajilikiregug.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/dukalalegixaner.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/bimufuxafenuxivitu.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1e19ffb5---sukowigetolurukosi.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/ditawudozuxitedi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3f7216da5a1b2ffd7f2c110a1afa90fd/3259165646.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/83436334705.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/36988341887.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/78484205025.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/fuzatofimebufenoli.pdfIn PDF document text
    • http://runo34.ru/attachments/file/56482183954.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/12736368675.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/zajepenavuleremavozazeg.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/nutaduvi.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kadegimolelilaw.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/vuzapevuwupoxaguxi.pdfIn PDF document text
    • https://redac.ch/upload/67237195624.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/sepili.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/surobisalonudekevome.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 17620 bytes
SHA-256: d0c6d9d39d764da8732f81e51c2e4d8b8759483fbf6428e16a31849d6c53411d
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 10228 bytes
SHA-256: 67e1b3c01d5da79759f54881a3d764ea7d823163e5bd0cf491cf501847be7e15

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