Malicious PDF — malware analysis report

Static analysis result for SHA-256 70812624de8a6e55…

MALICIOUS

PDF

139.3 KB Created: 2021-06-23 22:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5249b6efcc5bd072e0d7ab6b78654c3b SHA-1: 6516fffb6d8fc92a2eb88ab53574b8da2a0031ca SHA-256: 70812624de8a6e550424a07c7917e0c5276eed6625fe3c9ad5fdcb960a0f6b8f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/e2b58a0193e5ef519184722c355bc0b1/70576847108.pdf In PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/21033646121.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c051901e---30310562380.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/5365405257.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d803d20b519f4c58cccc9e333be1ec79/nuvudawiso.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1c6f116daf860ea302b6d5303e21638a/difizesenunutigikenij.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5b622c2a032e0bad412af188770e80ef/xedirubefexopavedi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160cb37f482f04---32595750320.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/30366906067.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210614/file/popenox.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/57878051975.pdfIn PDF document text
    • http://bjjiffy.com/upload/98472701924.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9b180884---3776955728.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ac16f0369c7d5c094f2b3ff33b013f2b/75168901772.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3c07f7c3868db83ca5b5cd5e4ad5397/misedife.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7d3d1dda3ce1241497b574f713d15afc/vazenubasofikajolaxem.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/66791411005.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c836b1b41---vilimazuguzarogivomovu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/56516343041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=problem+oriented+medical+diagnosis+pdf+freePDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E38D 5616 bytes
SHA-256: 73e107d49f498050f5e5d87fa54f8ecb4073984c0b36740818d25af487d70dae
font_01_sfnt_off0001f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F684 12316 bytes
SHA-256: aaa3a11bafd07a7e2d8331b69237fdb83cbbd779fe8c70b7fbe13ae5c3f0dca5