Malicious PDF — malware analysis report

Static analysis result for SHA-256 3407869db4e563d3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 11:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f06a05c607b57ed31dd05a98b66fd01 SHA-1: ed4bcc42be3ead3dd74dd3d97a80fbbac269b53c SHA-256: 3407869db4e563d390a2c698c2a8df25b02aec1b869d6406218c4175b1f3e686
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=ballade+pour+adeline+piano+noten+pdf PDF link annotation
    • https://clifestyle.net/uploades/userfiles/file/roniwolurol.pdfIn PDF document text
    • http://atya.eu/files/file/wafikarefelunebuvesunup.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/wetivonag.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/181d423324e9e4b0d4ee9290a0e5c724/30256596965.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/jixozafesomafop.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b62c1ab4f107da1dcae3a9744efa8643/dulufa.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db4929cf430---lofet.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55ee4a7c2---zatawibetexedobil.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/tetuxofezigofef.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vimuwivadepuwejawaxag.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/r3bj6i7idb131okt2bgji34qk6/revimiwixowudaroni.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/36882598647.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9bd533f6---38561228676.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/5116030720.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/wajitesulipubot.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/levefuzamavoleba.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3fc4fab7a463ef592841a33556ad3bb5/40156490383.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rejegukatuvigax.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/v7p0ces2ags0bjdtdcifin931c/23639294147.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ca86265b476d11d75f380d308173b5f3/nowiw.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cncm9f6e67ovhb0bf8ic1einb6/sopakakibufevaw.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/rerutof.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f250d9c0668c3739784a9874d2ddb2a1/dojatipup.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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 10476 bytes
SHA-256: 091295f3d12b7135b86131bad7c24e5ccd61e155b482ea305ceb0ae61d436ecb
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 19628 bytes
SHA-256: d57abcfc8e7b2a1c5f70c8d5b4b1f36919491abe9bd84849a3cd6e90e1ec9b6b
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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