Malicious PDF — malware analysis report

Static analysis result for SHA-256 916818dc8fc1966c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 16:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8a2984b751e2b91c93649b044728e4e8 SHA-1: 02dbaf82260b109f904fbe75ceee43a1049ff930 SHA-256: 916818dc8fc1966cccab1d2503ed4fd83114a02049ecb6a225ec161252f3cb2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d4a1906918a4126ffd9668c1a6b73b92/notobojegi.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6206bd0ca8---netolupazevupazotanufiwiw.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/xobojupaledig.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9b1c5df1c427cd02aadfbf7aabd0580b/61290006167.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/32592761960.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/47826066658.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/45596f8d9df4b39aba6f7834527b56a6/86026544949.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/67ec5l48ii54dgcua25p5ungb7/widutin.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/zerovakibapesejevidat.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/78645947211.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/kezonutudilo.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/bakenujitatexuziwer.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161029629c1951---xubumawofukodob.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaef855c8---mekewuxed.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/94176723520.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/pikoja.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/15aa8e1e26e307c07200cd55d8a3d178/76010523701.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/60021007013.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/sixorif.pdfIn PDF document text
    • http://juha.be/_files/file/vevazosevefaden.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13093be0e---80239139517.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/12167dafbf1e552c9dcbd96966291c91/36207309224.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/76936997126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=comprehension+passages+worksheets+for+grade+3PDF 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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 11280 bytes
SHA-256: cf3903204c1a02512418b9ae51eee2951db352ed6fb56625ea45bf3a8ba21687
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16976 bytes
SHA-256: 668bb19a43ec5a639707d2bc45340b24d54999c2dc58e48f4a720387b491ea80