Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7ed5f2fbb933d2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 21:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14675d7a0ca5541a4c7c36efa908258a SHA-1: 64a78d6ab8be8ec953402d536b2eefbdba296b6b SHA-256: ad7ed5f2fbb933d265a8aec15f085dedca8879d4fdc14d0bf2d88a0eb5e117a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to domains that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=love+shayari+mirza+ghalib PDF link annotation
    • http://agavietnam.com/img/files/77794478752.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/13916110789.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/kajujetarewegariliwoni.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/febunavika.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/13024184690.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/99250316085.pdfIn PDF document text
    • https://securitydm.net/slicice/file/79027424347.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d82d95c7---rusoxufuzixat.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6291a395---17751718159.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/63202831539.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jifamiwikifefiwililazora.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3659e0372---ratipazalulozukipi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/31aa493f5b87caf9cb651893ed57d7cb/lemubelojomuriralifi.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/dumereputolajakurut.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/ravatigilesosupigiveja.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/xolepumitidawujewugabukax.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/40536815827.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/makesaj.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/23797878169.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/43213276226.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/8295424032.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492fe7f0a0d---81694561132.pdfIn 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://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_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 18760 bytes
SHA-256: d9fc8eaaa6bb1b98f3a9b90997ab0ff01ea26954a5c4e7ef7184c46f0c3d5c4a
font_02_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 10688 bytes
SHA-256: fff5c01036693108e16dd0a8fc9c685a8d2d3119edd7ba4f7252877ed616a263