Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a3b0c0233fc577…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 16:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ded53db96e574e2b3d4ba0b48f9df6a SHA-1: f8c03e86b5c43800f08d6e632aaa1778f05aaaac SHA-256: 90a3b0c0233fc577c84c5c978fa0587d9c506a23ba7cd9a1d9c0205ee2cbedab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the document is part of a link farm hosted on compromised WordPress sites and disposable domains, likely serving as a lure for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ee9d5c71601a647cf59c80073315ff73/javoziwasazipiz.pdf In PDF document text
    • http://archi1919.com/smlclub-files/file/gexaxuputu.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/sotowiromaxumol.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f51510f5---91105341479.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/bejodifiwewi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becf8d06744---25782098364.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/43087844244.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/gonabalifevuxabitatiwi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3cc0a90e1c4b2a21d495ca0617033498/99655010050.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/31506111144.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/47948773368.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124d8ebb70d0---45799437905.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/6007800936.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/razisivebufura.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8edd460ad3---vakizutezazukevobibufe.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309c1388dc---43329140692.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/24226603421.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/96814564656.pdfIn PDF document text
    • https://dm288.com/slicice/file/fawafosu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f60d53d5383d7ec13af5502fe20a6b5f/91394675864.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/54104584782.pdfIn PDF document text
    • http://minhanh.com/files/48238722480.pdfIn PDF document text
    • http://halaljones.com/uploads/files/37580592046.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/95352786219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=employment+separation+payPDF 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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 17480 bytes
SHA-256: 626118b434035046f1d8ea602989cd7c54083482a1c93c250b611cd14dd3c000
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 10508 bytes
SHA-256: 2db84408269801f461b8d518675408a4d099d774a3c93a886e30f1b5273ca05f

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