Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df26a356090be5a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 06:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ca8bb7fb15bd3524a2cde9650465427 SHA-1: 71217f418b5f47641e0a0f9a6e4f9679ae697009 SHA-256: 6df26a356090be5a0ae7c29d5c73773f16c2c6009c6325ec882db21ec8e33810
96 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, with several hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the structure suggests a phishing or redirection attempt to potentially malicious content. No scripts were extracted, limiting further analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://pindimana.in/uploads/file/vabomazib.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/lepabofukavemuvavajo.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdde450e8---nipugepel.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0a0933aa---13672676794.pdf
    • https://goacetours.com/ckfinder/userfiles/files/xiwotuvaxipotox.pdf
    • http://vasekurzy.cz/userfiles/file/18107652195.pdf
    • http://ugrctrani.it/userfiles/files/xunumokefo.pdf
    • http://life-homeshop.com/asset/uploads/files/dipetaraw.pdf
    • http://jaluzipro.ru/public/userfiles/file/63581515823.pdf
    • http://stapper.de/sites/default/files/userfilesfile/97988554922.pdf
    • https://nguyenhungstone.com/uploads/image/files/gasozariwo.pdf
    • https://healthmatters.me/userfiles/file/12642391433.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613706b722f5c---zefivadejekazogixaguvuzo.pdf
    • http://nepalbestcargo.com/userfiles/file/refovoxikepavidigidenugid.pdf
    • http://taociren.com/upload/file/210909021319072001xpjb33fbz403.pdf
    • http://hasadtemizlik.com/upload/file/79437668695.pdf
    • http://beverly.kopanramen.com/uploads/files/74636939450.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/ruvedopadunenogesuruwix.pdf
    • https://roshnaai.com/ckfinder/userfiles/files/xidukexibiwoloxabok.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/gigebuworiwapoxubemizesal.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139e741ecad6---9747748092.pdf
    • http://stamforgtechnologies.com/uploads/30607860631.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=subway+surfers+instant+play
    • 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_off0000ec73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 16792 bytes
font_01_sfnt_off0001048a.bin
190c90711fc8264f423184e74a25b32f872263f7d694502ece7363dba668e273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 10744 bytes
font_02_sfnt_off00011d35.bin
e9541dfe7891c860c665b529efbd5b67a41e855a3592c12fa13d832832a6db44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 17072 bytes

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