Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1120cd5a5e54159…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 00:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7f66b7d50abc6b67e3ae3241d8a8330 SHA-1: 26ed3aada5adc168014b0920f485430e89f47ca6 SHA-256: a1120cd5a5e541593e4816e4fa7fa82a2a4e1f1b4e9e132a4412a918d8455bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://centromp.it/userfiles/files/xafikol.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140b333da0a5---3536066380.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/3042292111.pdfIn PDF document text
    • http://webursitet.org/Files/file/pububefesifigojoxemefupog.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/81069672093.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9fa211fshagtru4kteanga8kj6/86513830869.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/35420060988.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210914060428.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/31900005030.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/88875598941.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/wefilepavawigaledoju.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d75d409a82f03605bcd6cf276eee39bc/zuxulumawelotoki.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/76052851364.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8b1149d5557b178f9a8d0ec7f9dcd4a2/detijugotifatogero.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/titisidizemososudadoverix.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/sopefizebizewiwa.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/nutumewunudaxizukisupa.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090410561273499.pdfIn PDF document text
    • http://friulanapanini.com/images/file/62255971342.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3869c962---zagojepabegiso.pdfIn PDF document text
    • http://zubrcup.by/files/files/dililejijekerebijuvovu.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/xasexadajodokexagebelunoz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2a915cf9c---zavowuxivojigowomi.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/betuwuxejolologozeluf.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/86969172427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=logiciel+de+retouche+photo+androidPDF 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://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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 10680 bytes
SHA-256: 488da67879d61123d2126b26493f127b45f87910bd62151e529e50bb02ae8c7b
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 17976 bytes
SHA-256: 8e8e1a9dfa9b2ba8e201dc64e785eaca550c2f5be188cb96e66b6c79dd98a973
font_02_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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