Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c381649614b9f52…

MALICIOUS

PDF

73.5 KB Created: 2021-07-21 00:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f220b732e308d881b61539cf40b9ef5 SHA-1: e0e0a2b37176d440336c47220b76aaefd6491530 SHA-256: 8c381649614b9f52d78b5d74b64282dd74c7f2e3ae997b980a29b08c5aab4e89
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/k95n73s8ffckccgbpfcisq3185/doruzonifumipesi.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/41537591706.pdf
    • http://allaboutdowney.com/userimages/51165988032.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/c5t9h0ad09msrvq25p4c5mujkj/94529829178.pdf
    • http://bocghebinhduong.com/media/ftp/file/44511740500.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/15fe5c7383949c59f13db455d2be0fdf/29483511586.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ac8ccd093eb66f60b734622401784ab4/83564486000.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/totaragaf.pdf
    • https://walkandsmile.com/userfiles/file/defupa.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5ff382eb1f20ebcecc652936dad28ed3/bavijosibotusilot.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074576e8475e---zumefelinerexavaxab.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f88ca465a6---32389763590.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088323f8f0bb---44582064605.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/negixinexixowo.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a408d2607---98293880049.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13987e77a4---vufuzosuluvaliduzideruguk.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50436794a---gafuxinoxanumabuvuveri.pdf
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/26406603271.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc9508b3f---sizodavejaxuvixexebi.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160beda4fd9283---pefuxepuriluvoribi.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/71581096526.pdf
    • http://atomleasing.ru/media/File/tebuwukibuparufinisu.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096addd688e2---42342336009.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/86356824268.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/beduzuvebu.pdf
    • http://rialta.ie/userfiles/files/11343118015.pdf
    • http://creative-format.com/upload/editor/files/6524755649.pdf
    • http://0vote.com/ckfinder/files/34629362855.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=knee+out+of+place
    • 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_off0000c241.bin
858141417fefc9408f2ef53194429306afc21063397a9f2c91d58a1800c93d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC241 15388 bytes
font_01_sfnt_off0000e976.bin
e83406fb50ab6ab466a03857e9f618cef2e83787219379fc040454dacb25462b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10204 bytes
font_02_sfnt_off00010083.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 16792 bytes

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