Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef364b70d7efbdeb…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 23:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcf4dc71d7786edd6dbb46b9cf5b2bac SHA-1: 9d17e7b03d24f5ef9c61c0c5c3cdc129908515b7 SHA-256: ef364b70d7efbdeb07ceee76222c98d5a9cd6de11c351371f91ad17d606ef7d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many of which point to compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure as a link farm suggests an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=nanotechnology+applications+in+agriculture+pdf PDF link annotation
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dab8b8f0fb8---nilijepim.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/jokexefetazawa.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/44198107550.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/pozenupofalobe.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889e2bbc956---13405900736.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/malotewunal.pdfIn PDF document text
    • https://bonacorsi.it/file/76987210554.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/tenijom.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/14357649946.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/80315794239.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/xidegixomexitekususinamu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160947aea1ce19---22756508957.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/kimakadonofifobakatomika.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/78238899037.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/lebuzajower.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/704a6641030c1504aa24ed505a753715/zuzakoji.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3797c20c---bupewuvoz.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607306b287e3a---sonezixubujureteja.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/12801779759.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/patobon.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608950549d5bf---76343802945.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/98945261391.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/duronimexisasunanuliluso.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_off0000b81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 11092 bytes
SHA-256: d38a65372e53336b06643665bbda04045848d211659a84ce567a9146d74ad144
font_02_sfnt_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 14972 bytes
SHA-256: e57d04c2b4cc6d51dff3a99b92dfb187536628348d939482ddeda6c4e864b565

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