Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ebd97a8b1b6afc…

MALICIOUS

PDF

73.6 KB Created: 2021-10-01 22:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: afe20f57143c3a6adba3adfafd79b963 SHA-1: bfca514c0754d7e6fabb9d772ab36a94ab5caf3b SHA-256: 36ebd97a8b1b6afc4600b87a61c30d5aa260f85106b56f1534d903d397b735cd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and compromised CMS upload links indicates a pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=prono+apk+games PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154214316668---lotulitilenadatuvemoxeza.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/bavibosuxowotakuz.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/bezukarifipazepeja.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/54329283992.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2ad999026675f45e12b39b4db9d5a6ac/94701606628.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/segogola.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614f7c53d8c23.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/eb971fe6aa12e0bc2b0072b6d6f18dde/tapiw.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawuvibuguzanofufomaxu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161491117e0ee0---74468361393.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/lajogom.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/rezepefotatubefifutidobe.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/34724530000.pdfIn PDF document text
    • http://capital96.com/userfiles/file/nirofapubinifi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3hjthna3oskojm4kb9f3jp9872/51704056013.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/50528657519.pdfIn PDF document text
    • http://aminotp.com/upload/files/gimoweg.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/j2u3glqlo361uha369lpfuo62b/27097929013.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gn3strtc7clg4gig3oviftkbg0/fixubukoz.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4bc6f0901---59876202367.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/33016377732.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///28808672091.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/65426402257.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cd4ff0dd242d224614a3cb1be2baf169/limodubifogubolidutotir.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC89 17464 bytes
SHA-256: d1db6ff0556796929c4f0f96ee2678e6aef3b49d770d64b6c921351cabdd660f
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10452 bytes
SHA-256: d8452f536fac8b48c90cef3579efd0bd5d3557aa999831a273f1509638481af7
font_02_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1