Malicious PDF — malware analysis report

Static analysis result for SHA-256 c260c77dcdbb9880…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 01:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6eb3afb2a6e5a4359087ead7abbca2b2 SHA-1: c121572e9170c206c538e09ee96a37733b8289af SHA-256: c260c77dcdbb9880bb378cc1976fc15904b92b2551d41d6e1febdb26da07a005
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous PDF files hosted on various domains, several of which are identified as compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://kxzyjy.com/CKEdit/upload/files/rofinozegikamaxoxuxoja.pdf
    • http://danies.ru/ckfinder/userfiles/files/kakokexegotawijinazid.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/43311126375.pdf
    • http://flapboxes.com/userfiles/files/52842206216.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/69282911610.pdf
    • http://furniture83.com/upload/files/tazodekiviw.pdf
    • http://www.saletime.gr/admin/fckfiles/file/susexalobi.pdf
    • https://granitnet.hu/editor_up/giralilir.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145045a5df83---koveni.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c9046f249f8e19a82737e439754c7930/xegozixajowuz.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/51oi4mt325sulndgp4v3106ra4/37069384211.pdf
    • http://nuk-amro.de/userfiles/file/bazeja.pdf
    • http://supragyn.cz/userfiles/file/83794094923.pdf
    • http://thoitranglani.com/upload/files/27213848310.pdf
    • http://qigong.ru/userfiles/file/61603628717.pdf
    • https://ww150002.linebot.net/upfile/files/20210917031416.pdf
    • http://cwpni.com/userData/ebizro_board/file/texujejadakazutanax.pdf
    • https://happycondo.leaddeehub.com/userfiles/files/50961391348.pdf
    • http://helloslow.com/data/userfiles/files/lukinanineposasedun.pdf
    • http://unleadedcoffee.cz/soubory/31251656961.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ninja+arashi+download
    • 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_off0000d335.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 16792 bytes
font_01_sfnt_off0000eb47.bin
6092876e9fcf0d1274558d823f79ea8c1200610fbececae33a7e4a6b32505a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 16860 bytes
font_02_sfnt_off000116c4.bin
57b33e34c22e4afcebe40aa81202bfcee41f720e8a7c395b35096c6d611be0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 10308 bytes

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