Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bb095553565d88…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 08:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11856c4e88612b10c0ce17cbb2becb6a SHA-1: 3d9ef96a4bfdf663b7e51252a874d3a85fa9ccff SHA-256: d3bb095553565d88cbdab746f9075916d3be6a94fe86cdbe801749e99aafcddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=quantum+numbers+explained+pdf PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2f3baa53e4e0b26c73446a5ac1986582/65728805242.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0c2c651ac56a2c9e369650f97d968455/49733668900.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/31032533273.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/518022d2d530195bf73cce55a7a405de/36257078149.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/36028961687.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/vuzojipajolijagid.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607151927b662---31457969504.pdfIn PDF document text
    • http://goref.ru/files/file/45051587325.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/kuxokofugenewadimugozoja.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6515b44e1eb7d6cbaa26ccd3bb86b972/xadiretijoragujoje.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/53518683410.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4491a2abeb8cfa3ab829b95570447021/niboratevedepomurale.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/126910cb8a84e5446b403dbcdfe6e649/kojukopavixuxepofezajo.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/e2n8pq9me5hp20sigheugiqlq5/45432083995.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/78161192104.pdfIn PDF document text
    • https://upaspor.com/resimler/files/sadipubanalip.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/masad.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b662701d2b3---lobuzolu.pdfIn PDF document text
    • http://ipceurope.com/assets/file/kulumojinir.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074900381ad5---kazudewegetugiwotagogugi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5cf834b13---32669245440.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/lumuxi.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/pekonutogiwopitozodi.pdfIn PDF document text
    • http://epmachine.ru/d/files/21374238378.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/lajigufomefusevedugatova.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_off0000c2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 16788 bytes
SHA-256: a03787d5c1848fbadf8481ed0fabc2c55c55f304b6fdc45c1c82efbbf86e1348
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 10940 bytes
SHA-256: 73513a583ab479b264f9a8a1e92cc939deacb5a2d961f5a50aa43690003f9566

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