Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9e5056c406cddd…

MALICIOUS

PDF

74.4 KB Created: 2021-05-23 18:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5c1d9c36ab19a521cca1a6b9de13163 SHA-1: 26d58b304d652f527e89d2140495d58b3c843c34 SHA-256: 5b9e5056c406cddd9b3b81f43ada64b14739c16cfa24b86d8e94c5997486e753
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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 https://krisoc.ru/uplcv?utm_term=kubota+bx2230+service+manual+pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qbfgbeo0k9jnm4j48sf6ufj2f5/76893394156.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3j1617mhesqshua11gd0tmk3qj/75803320950.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66406820c---duradulubenegum.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16076a00a3531e---lazozuwikaxane.pdf
    • https://kurtoglumob.com/upload/file/68885948599.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/08kg6ogkqlcap00kfivfkf65c7/fatilavonukuxor.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/incu5ncb304qqdgn82cj06ij58/vigolubesezupeni.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa8588ae7---83917455399.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4752827d9---visuromalidevuvufofuva.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c40759737ef20bfd8aef12f594fb86dc/jipuwuxupodurewukatowegoj.pdf
    • http://agcslohian.com/userfiles/file/kugoxudirenekonodoli.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ea314f19c1da0ee25a140cdb6a0b0688/sakixaximojolitunofe.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b144f3fbc---67059209297.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2cf.bin
173fe87267149eded6058afdd66560a25c9fd1f85f0013e6ab53f479b2cbd117		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 5860 bytes
font_01_sfnt_off0000e6a6.bin
2d9b5bff73fa7aa96444860ba815b421b9af61e206e07456f869f7b7beeebe9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 11244 bytes
font_02_sfnt_off00010cf7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 4324 bytes

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