Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e19bc957113ca5d…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 00:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 156d0b47b1275886255ebbd8f90701f3 SHA-1: 7c3081429b00ad78e845bcd7c8ca9af2cde34d46 SHA-256: 8e19bc957113ca5d87573c9563d6430011505fe57c83fd26dfa94aada3ab8090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics indicates a clear intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=classical+roots+vocabulary+answers
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160905dee8c87f---gududu.pdf
    • https://ivanamihic.com//files/62842089792.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b340870f83c---65633390520.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/91996110476.pdf
    • http://com123.vn/uploads/file/temejakegedawu.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/udlp5uvi3qalbqmcm7vk9ipj4n/ferolodevikopeboruvapave.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce96d253b2---zunulisugal.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8cf01839e06ac3813e9e7515e3ded9e7/97141059742.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hv7nq9oha4061d49ibjmc5oshi/43321842700.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098423bc46ca---47007746052.pdf
    • http://www.awakohchang.com/image/upload/File/7728644023.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160832e2aa8748---69151660527.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/cdae3579950b53f491ab52f2f48f141a/bunozenakupov.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3766f287---verojejogozozajagisipa.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jm202pm7mjjfgglk5ni0k4v5d8/likojikixotokem.pdf
    • http://esejsc.com/upload/files/wawojiwemeko.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2f7d469d---51765177070.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/ralijovugar.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68a4b84a4---69067451371.pdf
    • http://chanakol.com/ckfinder/userfiles/files/rusewisofevew.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2d07fda576d6801473da36fb70b5072/karuruzadikasadaviri.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b912ce3a1ef72aabe006e6b8743b2b04/87711993101.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5bd8b7adb161343a7b74c839e1eac81f/pabifibav.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3843fe17---88805981583.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_off0000e6d9.bin
7508665aaca68a56f7444557d233d9562439cf5f5264fed7d2542bfaa7ca2c57
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 10760 bytes
font_01_sfnt_off0000ffd8.bin
e434357c9f09d1e8a910a56d03b24fedf27ce52e5c9aac04af47818d38745b79
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 17804 bytes
font_02_sfnt_off00012e90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 16792 bytes