Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62f596e13a3142e…

MALICIOUS

PDF

62.5 KB Created: 2021-09-26 04:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: da23d63514c9ac1bf9acc1e49fe94db0 SHA-1: b9200199e1850ff9318ee9ff1d05344edb8b951c SHA-256: a62f596e13a3142e838377a705704f81a7910486c379cfc1128ba81678dc2675
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to numerous compromised websites, some hosted on disposable domains. The presence of external URIs and compromised CMS upload links suggests an attempt to distribute further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6644

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=cast+photos+to+android+tv PDF link annotation
    • http://neurooperations.com/ckfinder/userfiles/files/dobotavafelat.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16149582693ec9---lorukaximizab.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f5d39034---93365158046.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/46479469547.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/836abd36fb2fbaffc036dfca52580156/79879424021.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/88441924070.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416fdef34a7---waloguxurov.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/26477395306.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210907211633942333.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/mozopokafexuwes.pdfIn PDF document text
    • http://sfinance.mn/userfiles/files/levisige.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gri5374a7ac5ofhp88f84ntop2/3535708922.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/44099094218.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/46913582980.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cefad99ed3---temasevonulitewagimaduza.pdfIn PDF document text
    • http://entrackintl.com/uploads/5241115503.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d24d4c59---kixonukulonij.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/52986668482.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/8o359lmc5cb64f48egoq94r304/judewe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae1043424---jusoxugife.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109052017226842.pdfIn PDF document text
    • https://songhong.info/userfiles/file/rexewogaxagopoxusov.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/7273452393.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/jozisulaje.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/29293626842.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 10408 bytes
SHA-256: bbff4790226dd1d9a8915e220e4f7d61e73f7d25f47b8868685bda5115265f14