Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e914a9dd545b40…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 23:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63f304601889d8b02b4eaafb9ebfa55e SHA-1: 3ce590a1b7f1362fc7d6d0ebeb0007b07da63efa SHA-256: 90e914a9dd545b407d0b07d74c4d1a7c5d0c2a22359b5e15bd326b42b76a035f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URLs are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://morethancars.nl/uploads/edytor/file/muvegujadanekifisoguxojud.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a48948cbc2b---2378789494.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tf25k9j1v6l131gobrj4rf53a1/65176511288.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0289c885a---58891413401.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8beca241---60599349216.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bigopikobupusevute.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/26338394380.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/3b2490632605c85bdb9f4406db0b7412/lakubebefu.pdfIn PDF document text
    • http://pneusmarene.it/images/file/57412676930.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/163218745.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/75dea02cc47d6cd17efa8c885ce8ecad/30084523161.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/fepowozot.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/lewofakurud.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/38734734257.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7c97fada---5999058570.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f354693a525---duwiwisukopedozovavaru.pdfIn PDF document text
    • https://kawanmto.org/contents//files/purumep.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/44023951054.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/34465888210.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/56768059944.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tfjjfc5jbjf2jtkn0hpeui64c3/korimewemotumuwume.pdfIn PDF document text
    • http://gr-chem.com/upload/files/49047850004.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e24920531d---filubeginoloxut.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/18212022159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cheri+cheri+lady+piano+pdfPDF link annotation
    • 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_off0000bbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC3 20488 bytes
SHA-256: 59f67457734f668a25047235c233bc67cb1babae717a56974b9bd77b67909204
font_01_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 10596 bytes
SHA-256: 2f3306560b2717f68e618a1fc101a506f76ad1332496ef654d5ff4c7c6704b28
font_02_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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