Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae0db0d829096a8…

MALICIOUS

PDF

100.6 KB Created: 2021-09-16 20:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51bf9f9b3e7510bcd26708033e794372 SHA-1: c91e6f174d518c34ed2df02a5fbb1a5ee2e9c786 SHA-256: bae0db0d829096a88d400d6dc2922a046fded432f3b4049fb455aa46878a51ee
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mlbcsimleague.com/ckfinder/userfiles/files/88424807780.pdf In PDF document text
    • https://calprin.com/ckfinder/userfiles/files/51996940487.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4e6328d74db6cc02f4c00985313b54ab/91149293061.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/mezidofusi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed429ce24f---55164119233.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/19829305420.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/46847414764.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/nebijalapuwutenufuzuxa.pdfIn PDF document text
    • http://stylekd.ru/files/16986691812.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/93424793590.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/91220025574.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ea86be51---88064970068.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/31661546905.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/berilamimivolibigezujibex.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/45013996904.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/69521797891.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/sujirifo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161401e7401dbc---99450771097.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/58502166155.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109090814294437.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/zekelite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=boruto+naruto+next+generations+watch+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://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_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 17920 bytes
SHA-256: ee81d22b0335af88e166983283429042cd6dbcfbe5af8c79c7f47f969328e58b
font_01_sfnt_off00015406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1D 10912 bytes
SHA-256: 97c6ccd09fb9cc8636643d6490d5d88d0b715f752c2cca5a5c255728eef6d2b9