Malicious PDF — malware analysis report

Static analysis result for SHA-256 293f1775d062ff4d…

MALICIOUS

PDF

100.8 KB Created: 2021-05-03 19:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: eed09bf4b2f669cedfdaafb7b5248d16 SHA-1: ee1a11eb6a33c89e7076ccaa28c0c4a83df28be6 SHA-256: 293f1775d062ff4dd3a4c7c9589c3cf69bcbfc77949ac59608cb4f4cd10ca93f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, potentially via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeeaf2346---87965915844.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/jmsga4qv1glgdo7t4s2v5albpm/46415558641.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0fa62e15009fa580763558e279990815/ridexipelabakuzus.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2fc7367d7---juzojojubefa.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/27c0cdda440be8e32c7e91469e78f1b9/jojijinofujeg.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762a0eaea5e---ruguguv.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/3260717ed0a0001ef0439d77a2b1742c/bipabi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/659d6bc4d54d6bc6b643b8de8a418a89/43642009763.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ca98c4e5---81255880775.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079128e87a4f---gememodorawisapadexero.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3nl8mgh4lf117hsvnegrq2ejbp/10871692410.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6e4ba357da4d52b24e30e137a7fbd83b/tegabusomijefurebi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f8c03b6182d6cd5c1bdd062447754c08/gavovalojedojiwinazezi.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/jb4rg2puoka1de5dt5pc2im1n5/11780021125.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/eff19fa570e12d384133ce56a633d579/67857273981.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/cc486189a7b2563bfa6efe8af8263830/nepujejitikizitowe.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7lrhc43r51v82dfq70ec0gseqg/kafofagaxetet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=algebra+1+chapter+9.+5+answersPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 5780 bytes
SHA-256: 866bfc66d2bf82718780bf96db84b9f0077ec0075eb95313010201dba35cfe11
font_01_sfnt_off00015d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D77 11872 bytes
SHA-256: bf0fe749a83494918346ad117e5ba14bd0c00bfee7a953f914dc91994a73d695

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