Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdbc343f6dc9a24…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 11:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37be2dd655c3a072b79e1cca4f6500f2 SHA-1: d77f24aed861122d0db537b7fc79c45b231d3e89 SHA-256: 7fdbc343f6dc9a24c11d40aeda9928888519ed89ae585fa68fdba516830057dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous links, many of which point to link farms hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and potentially deliver a phishing or malware payload. The presence of these link farms and the overall structure indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608576eb0c84f---89345926130.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/kojozukagozole.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/72050171148.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/27213414418.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160964b167913c---32181843327.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/birozexepevo.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/61807288502.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/86448020742.pdfIn PDF document text
    • https://appfacile.it/file/pakitoriwabevuni.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/xivilixapavilo.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/pemovig.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/jagakimetegupidimolume.pdfIn PDF document text
    • http://abwva.com/uploads/files/66155465202.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/vokivonoloro.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/46723420102.pdfIn PDF document text
    • http://bakoca.hu/files/file/bufik.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/4905212145.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nezupeduzizejoxed.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/r3l1qmskj25a8amo3qfcj63moc/21427749050.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/70835856157.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jubaxesezirem.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/57783211240.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/firobinefoseraz.pdfIn PDF document text
    • https://immobilgold.com/file/25044463373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=disney+piano+sheet+music+advanced+pdfPDF 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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 11020 bytes
SHA-256: 5a967ca696aaabda76eee2e4260a542cf92a136253c4ba35b54e4afd31c302f6
font_01_sfnt_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 16288 bytes
SHA-256: 0c5c769a5691584d47b1349e9ce59bd7da798a6e4e5675eff1160a788f13b41d
font_02_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1