Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97784ac3bc9f2a3…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 18:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 922cca8b88ffd37aa369d97bef063791 SHA-1: 1f5a442ebb56ac8925d479ad27d5ac43ee0bfea7 SHA-256: e97784ac3bc9f2a320de2b02669908fa9f0fb8b535145ceb74d388ef308f6b03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm hosted on compromised WordPress sites, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=nephron+and+kidney+diagram PDF link annotation
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb07edce3---62624692763.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062301050766.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e89dd8ff6---53553807247.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa051035f20---didufalobazikegimusasu.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/damerobug.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11071374971.pdfIn PDF document text
    • http://gtshotel.it/images/file/91762971793.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/350a303891b7c8da5054ae5bfd8d6697/letebololuwogumonem.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/figetofizadukitas.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ae76a4e7---fuzefupibakiresaxugiw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c23c0950---jugazaro.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b6317175---detofepuv.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2daibit0i2s18330re9tiqa3in/wejisob.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d211fc00689---kagitodalok.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683ac78ee0---35939228009.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/93413031146.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/33108522316.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/funigoxigexifujiwinavaj.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/66j75hvsa22g535vc05t6kcprr/finijovilikat.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/85cfd3f905efb3319e55f304d0e464d0/xugajimilanikiweju.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/3ccc5e7a4183ffe549ec09abe530d210/68890329362.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9iru53s5jrnvihc9ciq6dj8g61/88082698372.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_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10712 bytes
SHA-256: 4d12042035712598e07a61b9c9e2ef0795a09cf44a5d8fe6db2d5908a84ed57d
font_01_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 16352 bytes
SHA-256: 4f016f020f8f7c67a326c883b52a3b601e799c08cbb04ca009db9f40a4fe4a29
font_02_sfnt_off0001361c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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