Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb45868e4a3bc46…

MALICIOUS

PDF

75.1 KB Created: 2021-05-20 20:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a3bab5d6e79c72aab224328eda232ec6 SHA-1: e53abb3d6aa4dce107b90725758fec70d4016504 SHA-256: dbb45868e4a3bc469148b4c0f18b1f361a33be66553695e118abf6fecd63027f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' plugin's file upload directory. These links likely serve as a distribution point for malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The document body is heavily obfuscated and contains irrelevant text, suggesting it is designed to mask the malicious intent of the embedded links.

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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160941f82b82ec---73041288880.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee863885f---berutajixavojibonuvul.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa0252893---42439408857.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/72450819778.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6885daae---kafejawumidaramafal.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/61371818604.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/11116537073.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608269338e446---13536365199.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/3009715289.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4e06b2df336db11259e0ec0ce7555232/39432285540.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/cp0vh9dj2bamru7nl0as5bu1i5/muvopi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/75388722863.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ffe394078a0703306aa2a3ded3533150/gatujurafivuwagomobuseg.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mojixilegutuvefe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/466d596d017d4370ba8cbc9d2e011373/56792669882.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710a7411c2b---kowoxeg.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/53d36e567efe365f7841a6a43b617660/xewabafipine.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/90113565603.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/japimesolegewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+mix+salt+reef+tankPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 4884 bytes
SHA-256: 5aa91735abe6003d78d6022d1ec32073ffc6612d268f41ac7cdf6a75e494ccd6
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 10572 bytes
SHA-256: e6ddb1f907b999c43cd6a1a7eccfafca37200982e2d77655b7b779b13c54551f
font_02_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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