Malicious PDF — malware analysis report

Static analysis result for SHA-256 59eceb4298019588…

MALICIOUS

PDF

92.5 KB Created: 2021-07-13 12:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fe39344e5174dd2126fe5ac60e99d57b SHA-1: 647bed41f786a51cff32d03d298939f835d08c54 SHA-256: 59eceb4298019588e52a53f58640008a9cc0da23847cb65eaafdc630615cc0a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://laborke.ru/uplcv?utm_term=would+you+rather+with+kids PDF link annotation
    • http://daisytalavera.com/userfiles/files/44324189024.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8b7a3769ed5a4e556d244ff2ca977e9a/gezikobazupixewamupexugil.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/sgsr4etj0da8hntqg2gkr8cdr7/76378753492.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/nasomewegivewoxojafelis.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/52480020529.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/sebov.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/530f3128a4b053600c3c74093c4958df/xirulupusuduvom.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/tuwifavevutojaf.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/866d1f12b8efa90506a0abe91913eb4b/31432603385.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/dbraq6p6093gkooq9fk388cpvo/36832091517.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dc130c88512---7100805797.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/katuw.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b85b82d16---gosisum.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cae70860830---64870981811.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tinipagobelubezumikuso.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/3908108355.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/44oleg3c71a7dtipf874u0h0ik/54104098189.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/zewinugawitovidolanamo.pdfIn PDF document text
    • https://sy-tech.eu/file/45872215726.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90125228544.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6104d950---texorusu.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/96751292599.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fedbd0c4e2---51673250872.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3771c871fb---xizuputizepipapos.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/950a28529f2f4aaa57dbfd971d6ed615/soxutu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2da3db8c749a635560292b6dea9de81a/zijagonaxeguw.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/de8753ad738910282816bf4e4da5f999/fexuzupelefivutobo.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_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 17524 bytes
SHA-256: 202e666aa75b2061542093b68f555aebbf8984721c58e55dab97c8448b5afc41
font_01_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 10624 bytes
SHA-256: addef29eccb86458e37c6022bc19592aee051daf034f3fde582e5707fb4507f2
font_02_sfnt_off00014cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1