Malicious PDF — malware analysis report

Static analysis result for SHA-256 278bd411e60ef5e8…

MALICIOUS

PDF

76.8 KB Created: 2021-08-28 03:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3957ed4be3acd473f90f14c736fcf0ce SHA-1: eaaed2de8c948b35f9daf8c0086ee7fa63d2b897 SHA-256: 278bd411e60ef5e87286231133909a0f73f70241b03d630fc9412c513f75e28e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://coretry.ru/uplcv?utm_term=an+eaters+manifesto PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9c670e78---92852963232.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/4098867747.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/22672687237.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/82800467064.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/45371021829.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/sawagosutemosajixime.pdfIn PDF document text
    • http://endemic-capital.com/uploads/files/bidediniremebu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/suwizivalotosazijikaze.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c59931670f69dd527b80f0bc1a51612f/jirovodaxegugibejibe.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/mujiwavip.pdfIn PDF document text
    • http://bibikid.ru/upload/72326630774.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7funavo1k3479k4v7f3qhbq1v0/43149671623.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p1pti6hdos7mki55le96jdoh80/49545938859.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094679e192f8---subal.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/24858646331.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/99729363589.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7iebpbs8iqc4hde075vg3npu3a/ribofulagixavitujogufafin.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/duxogirukipofajiwawe.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210627185403671876axk8016sg2wb.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/wivekofinukas.pdfIn PDF document text
    • http://ymmicro.com/files/files/18397015539.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/2ad5c8d217b272446dabffb1d33256eb/kakawun.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/97353871284.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/sadumedabopoxeverijuxi.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/jarenat.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_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 17460 bytes
SHA-256: 67e2e849a6951a6ad8b0c1296593c2c29654f496413bfbef8e6451a99369ee20
font_02_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 10308 bytes
SHA-256: 72bb10bec70130afc3825f62147947c5ed69ce534c46d3657356b9ae6f10ef23

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