Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc16ae0d39e31f4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e04fa3da373418ca737164b89b990a3 SHA-1: 1e8039fd03178c5a600381d5ce4806595e20e346 SHA-256: 8fc16ae0d39e31f49688736a6c24500d28296f28bae27f9ce47b9177b87aa79d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs that form a link farm, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=download+app+gta+san+andreas
    • http://uptownherndon.com/uploads/files/91269710253.pdf
    • https://najlepsze-w-polsce.pl/uploads/loniwurasegagenovejotipi.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/wifegavakejabekutufoge.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/54236533410.pdf
    • http://abwmountvernon.com/uploads/files/60309629063.pdf
    • http://dulichtantai.com/files/uploaded/files/42690395500.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161396b4f4f828---javiraniputibom.pdf
    • http://tfe-design.dk/userfiles/file/44230849038.pdf
    • https://dsverano.com/UserFiles/File/xevinodegulip.pdf
    • https://hoalavender.net/upload/files/54519407913.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e268ab8d43---66061530090.pdf
    • https://impulsa.mantareys.net/uploads/plantillas/files/belanunewukif.pdf
    • https://melz-feu.ru/upload/rebiwefekezunovuwameviwik.pdf
    • https://mimpishio1.com/contents/files/24522440707.pdf
    • https://bisnismedsos.com/userfiles/file/56064060697.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cd3652f00a7a2716ece6ca3861c91826/jofeb.pdf
    • https://truckforceone.com/upload/editor/file/41594150021.pdf
    • https://kimcert.net/E/file/belotuxoxobo.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/65169763436.pdf
    • http://jacsonsfurniture.com/userfiles/file/maxogabufosabekanoxeto.pdf
    • https://toananhmedical.com/uploads/files/xepomelewix.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_off0000de11.bin
311d79abda5036becfe676dcef1f7adb816ac861788968173bf4ec96fe8162f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 18996 bytes
font_01_sfnt_off00010ebc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 16792 bytes
font_02_sfnt_off000126d3.bin
05f94fd13312def1651609eebe48485252108d43c537fddec7c085cfbc660f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 10560 bytes

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