Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32ad9a38a3208d8…

MALICIOUS

PDF

71.9 KB Created: 2021-06-13 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2f76651281d7fd154aa74b460fd6551a SHA-1: 15a5250da05be523514b042802485bdc53ab1406 SHA-256: d32ad9a38a3208d8473102c5e4892673664e54d276b3aea2a691997fe94f987c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body's metadata suggests it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://infrive.ru/uplcv?utm_term=awesome+mix+vol+4 PDF link annotation
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/85b9c3065ceecbe731208448c83c3495/limodigu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70ccef2d17---1516239.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/16230556997.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuvematoxuzaginima.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/342c562b522be34e8c6575435d6a10d3/46551102361.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f3b9c8d8717731063f7a044a4b7fb6f1/ditufumivewirikuvebipogo.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k1lo7jh16bbstlt334b5f94s6o/nedotabavomexisosiwuku.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210510024902_336813593.pdfIn PDF document text
    • https://ewt.cz/res/file/91337307651.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/8522444839.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd28398f8---73218590494.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98cbeb17fa---sozixasuzime.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/a26d600b4b8721013565f3bc70c8341b/bimewowigikad.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4d9152ef---79467805467.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a698e59ca1b---50573843632.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/nagevosikakakoluputoki.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/909f2a1afcdde32047f5dab66a82dd05/34912787027.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/tudesesejalopifolorigu.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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 4820 bytes
SHA-256: ff8d8176e2916b5483ff57756cd042f7ed820a0adfaeaaaf8e98b44c62518ad1
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 11332 bytes
SHA-256: bca893ce8ca4718e13d6574708d9cebf7dfea8b6363f45f7aac7ed33d1d4a46d