Malicious PDF — malware analysis report

Static analysis result for SHA-256 175f4dd335fb5169…

MALICIOUS

PDF

102.7 KB Created: 2021-07-02 02:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d623ff4d5108d7d928432da1e7d5dfd SHA-1: 41ba4c1d7fb9a5d5043bc8f5927d249ae97ced4b SHA-256: 175f4dd335fb516936f977e7a2617e7cb25a31b820b57d42254e638acda2d743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://brawlcall.com/ckfinder/userfiles/files/fapabikuxe.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf027b49d---litovosejarapibadovo.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/8c7448be3b1b5573cfd3d47ed614fe18/90063705285.pdf
    • http://fluitec.fr/ressource/site-image/files/zivumezagaxo.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5701d28c22---zudonazaj.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d93429d0---41324291163.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/om4sr9a50338123sf325jqf1jk/bemepuzalobarurebukosufiv.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d4c33baf0---gujuninaketaveke.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/dc23c13ad0c58b651b3b52190e867840/46121064371.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/mofogekerugigunapu.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/30602981202.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7526ef8c---11536611306.pdf
    • http://jedwines.com/cmsCart//upload/file/lututobuv.pdf
    • https://maisonforville.be/documents/file/lizuvolor.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uqv8sogkg05qf8ia74fpndotk1/20771200873.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160908c365d49d---tamanetepojafuxilotojeri.pdf
    • https://stillwaiting.org/userfiles/file/potigobufusigekufu.pdf
    • https://pypconsultores.mx/userfiles/file/nivotiwufojubenukokejin.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c718bb9dfd---36461094844.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/574dbe197d823940bebc8640b06cf5c8/lomopomine.pdf
    • http://stoewebdesign.no/userfiles/file/93911612697.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/03e11919d688f7d148f1c7b3ef2a1f84/gonobeneru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cars+1+full+movie+in+telugu+dubbed+watch+online
    • 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_off00012bfb.bin
282886eccd4c3c3f2c9625cafd45f1b07c2f3fdd03e176257bec52f108d14cc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFB 17756 bytes
font_01_sfnt_off00015ac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC2 16792 bytes
font_02_sfnt_off000172d9.bin
c5f2e95e34a7fd75be0db5634bad43d9804cd6c037126f3ddbe0e262e328c069
pdf-font-stream PDF embedded font (sfnt) at offset 0x172D9 11396 bytes