Malicious PDF — malware analysis report

Static analysis result for SHA-256 779076d9d30c08b9…

MALICIOUS

PDF

92.0 KB Created: 2021-08-26 23:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42ed91001d3a8897af35efac0e040a24 SHA-1: 184c199e9ed5db0d75595ef68edf46ea31c3e3e1 SHA-256: 779076d9d30c08b92affb2817f4f5edbc660916a5eda51c806bdf08a3cd91331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=quill+city+mall+aeon
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ukf7ejp5orpjavjti42lrorno6/litilowubezetuvazemido.pdf
    • http://www.proyecpapel.es/ckfinder/userfiles/files/kuluzibivev.pdf
    • http://okwmd.com/upload/fckeditor/file/21012204132.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd25c9fed124289660a26fbb32cb15e7/bufiwilolala.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/35138114468.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6850ec4c---gugilogebaw.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bc33b5079---31168356.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26695cf4d---27446088980.pdf
    • http://rebizplus.com/userfiles/file/95003635198.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d057e0ec4fc---bakitogukidunusuko.pdf
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/57630576253.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cqe118enb9d3ab9ogarbe41mpq/69079980165.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/770004c3248f84366bb28a99a6efb766/85437680038.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2618c735---pexigu.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q9q7h4qdr916ttbhc01ju7rr7u/75133415740.pdf
    • http://dambi.pl/userfiles/file/zafarazomikatinazalexosoj.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/341ce3e8c75c49ebe2e9f7e209664162/sogokogukabevoli.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/76a400119998d04a4cc01fac5ba1a793/davilosagaxibuxu.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c066989c23e941c12508650f3551f745/9926153276.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/97dcdfa93cd3583fe781bc95268e2e93/14982343990.pdf
    • http://texmet.pl/userimages/file/76327013467.pdf
    • http://brainbond.ro/userfiles/file/3175410394.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_off00010509.bin
927abbc6fd57f8daacdffc5e49c405e6c58289a6e905932f28e79f79afb6e3a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 10396 bytes
font_01_sfnt_off00011caa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 16792 bytes
font_02_sfnt_off000134bc.bin
7e5f49a53dbaded3f28ec08c43c1c93085fd9f60ae64f4ac012895ab99154b16
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 17196 bytes