Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3f80c2caf07d9f…

MALICIOUS

PDF

76.1 KB Created: 2021-06-10 20:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8cf93083d943516995e27dd2a166e7de SHA-1: f9928ede50fdccc1ab6bb8a844d8e4ba30b355bf SHA-256: 2b3f80c2caf07d9fa7c28de502800a6abf0ece485a645992a8c6b86004f297c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=arsenio+lupin+libro+pdf PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d46c36cf---40573940640.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e0f5ae1061e64582528065448f2888df/pubogibusiraralop.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zenuxikekogaran.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9b8484b35037642733de20918d1819be/temosimiluzi.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/75542911438.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/74gun13msorsl2nve9pjug6du7/vajavobebawiwixiwoxe.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e85298c75cea9722473716da7c8a4c5a/tekepekukosebidorelewer.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2eb06d5b36fed652d6f96dde9d60408c/9015123443.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/af82b9f1c2e2d53f731134587382d37e/95446582194.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1793b5dda2e4a0107bd1e9adf9250e80/natupubajinuxibimak.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bc1abb5907ee4ef91693ac57a6c6c098/85733286040.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11977cec3---ladoxifosagaja.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk85jgve3b2b9joocvm836m9fo/tixewawulabo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2093cb0e---sanikereganewenikijaw.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/xujisom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 4952 bytes
SHA-256: a34344b94b17ec0ac9c1f6e8ad44494e424df2677d5ecc3504b66b1efe63d47f
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 12288 bytes
SHA-256: 1236f6a0f4d33193625c608c44e1cc6daaad1eb91747425af26ef076e20045cd