Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d6b92da2f581df…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 22:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd6cec68f0622cbc2f889518fffa4e5d SHA-1: c5169255ca2a04b1982ab95c85845fb9a287092f SHA-256: 99d6b92da2f581df9788b934b4c4d0ed6f77e8ed5739c362028fe14c478f8a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=maharshi+telugu+full+movie
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/pl02nhh24igb652lptigqodh3o/31207271342.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cf6617c8ddfd3693597de4b141dfc054/10240119307.pdf
    • http://pretaporter-pegah.com/userfiles/file/65775145631.pdf
    • http://maidichike.com/upload/files/rolen.pdf
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/89345407570.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/fibakida.pdf
    • http://www.andreapondika.cz/file/81395365680.pdf
    • https://cupanghitam.com/contents/files/bifidupakeveduzame.pdf
    • http://midospa.com/upload/files/fozivokajivejunum.pdf
    • https://mikludava.lt/images/files/jorenaparofuperijimode.pdf
    • http://hoinhikhoavn.com/img/files/64506189368.pdf
    • http://hoachattn.com/image/files/puridufadununefumazaxedij.pdf
    • https://learningsolution.ca/userfiles/files/josuvifanakida.pdf
    • http://uteambio.com/upload/files/38778718747.pdf
    • http://csc0351.com/userfiles/file/20210918083203_mhx8s2.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210929_74578AD833A53A60.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/94190859437.pdf
    • http://pluimveebeurs.com/userfiles/file/83820219007.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9007d81ca0afadc6ed946fc294beeea8/93412932976.pdf
    • http://ackerviewguesthouse.com/userfiles/file/jesadu.pdf
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/88483710439.pdf
    • http://grandfiltr.com/files/file/2202445711.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b11b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 16792 bytes
font_01_sfnt_off0000c932.bin
db7eca9016402cf8c8c2bdc4bab7e2867f9b6cf87acf34c0ec92c7ec574d426c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 10716 bytes
font_02_sfnt_off0000e1d7.bin
45096eb035430230e186df1ed163638026b342762ee45321b24520a1606a862c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 16560 bytes

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