Malicious PDF — malware analysis report

Static analysis result for SHA-256 e537b266e79bb9f5…

MALICIOUS

PDF

84.8 KB Created: 2021-07-29 19:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca40fed50a5e9b989f6d529b7cf2f6c0 SHA-1: 392a586536791f91f59b7d127afc52aa984bc68d SHA-256: e537b266e79bb9f52c75a494ee9279aac30fbcd70e40c0c8a7a670216f39f5c1
154 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, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=connecteurs+logiques+anglais+pdf PDF link annotation
    • http://maychamsocda.vn/images/userfiles/file/fawojoxafavunabiwonirero.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/50028273542.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/21668054153.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/46969960910.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fehlig42arti7ir99gmdk30824/83145790581.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/35014318772.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e0030fef---64179238654.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/pubosodezajus.pdfIn PDF document text
    • http://espiber.cl/images/uploadedimages/file/paxezimegowilonudotujo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bb8dbc4---97574895815.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/talubuparadev.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/kilibiwo.pdfIn PDF document text
    • http://schubert-hh.de/image/file/49086631734.pdfIn PDF document text
    • http://planbmedia.hufiles/zilulixowegedeb.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ing076rtus84d6qssm7pn5f846/ratozulujusifagu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/488bc1357395bbf9f968642e375147ff/lubosuxasemanexigagaxut.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/otpcljiuslphva2v13qf6lk4v6/44860052969.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe5e3a1c4a---40692138608.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce78f36e89---wavitorigezekilorabitabi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/qqb4gn3ns9h6burr6ghtpchak4/gijuje.pdfIn PDF document text
    • http://veivel.com/userfiles/file/71095727085.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc3d81cc1---12850235336.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5u6qcjnblhl9ceh4sju8fdku4/lelopozafigipebuj.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_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 19320 bytes
SHA-256: 5c6904d60df5996d3a842e46d5f3afb8869693e134d83adaf1f2dcd52298a1e4
font_01_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 17752 bytes
SHA-256: 469df10fb9ee7a1bdbd584389ad1726a4ddede9f3a2b96d96ec16aab987b1f50

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