Malicious PDF — malware analysis report

Static analysis result for SHA-256 319c9f4211d3a5b9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 22:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffd51587c6b0e767ce9c211af465feae SHA-1: c379ada95b220bba93fe862842f1e0734cd84bec SHA-256: 319c9f4211d3a5b97e0c0056de732a28def9c355f630ea05b14d434a553ed6f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=how+to+know+who+looks+at+your+instagram+page PDF link annotation
    • http://pwmtqatar.net/userfiles/file/tukomifasefiwodi.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/damitiwifobikiz.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/kexapekuw.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139293069b---14611939993.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631615889.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/wagusaxumimunolovi.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021941430511659.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/gotaborudilewidowuki.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49505093589.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/69722344191.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/19548566090.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134729cd0e07---64162718898.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22d363b69---lumodiwimebe.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/pejezewapa.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/s2p0vug3jis1490bu0miuqci91/tegozim.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/mekogogo.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/sajamebojulomovum.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xamodazazoki.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/gilakaseb.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210906103844_o7p8wr.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/24cd7ee6de8884ca4c4f290152f6c3e9/sawumunofokezopuj.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/89054430916.pdfIn PDF document text
    • http://friulanapanini.com/images/file/vejenakasuli.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/98553975544.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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 11084 bytes
SHA-256: 3f2c92468b7db8344d8e315acfb9f7acb02c3a20a65a21fe5e8fdd9d2e56181a
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 17652 bytes
SHA-256: 00d6e4492c0d1348f8fa0c60cec2bbae4bee55d2f5b5f687b8c4a67bb33d0168
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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