Malicious PDF — malware analysis report

Static analysis result for SHA-256 f798ca4164e7d05c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 19:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf62a183f719ee5c25c85f066f01b356 SHA-1: 898be4363d3ea8c44bf177be7a66b5af338162a5 SHA-256: f798ca4164e7d05cf0000cf1afa4e4fc454dd70c6eb29cf0a9a291665745db6a
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. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The authoring application 'wkhtmltopdf' is often used to generate malicious PDFs that exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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://huntic.ru/uplcv?utm_term=smart+attendance+system+pdf PDF link annotation
    • https://machnhaduong.com/images/uploads/files/99840933128.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c2c9a314aaf3e9765a7ac45c4fa8178c/1556656041.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/93347658879.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114fffcb6d2e---vobubulivepoberadelepo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0631de35aaaf35c931efc49a6298471b/revojipina.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf9476757---xalog.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c11dbe43a---29241221944.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160900d68c1fd6---36152086933.pdfIn PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/21024800837.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/51u74djllj10inquvgav239v34/99362646180.pdfIn PDF document text
    • http://ezibra.pl/upload//file/51210233862.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/sevinumepadexow.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d1d298a097761433d0b13aee66615c5e/65702863635.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160788d4477e81---vevakid.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4ad05b9edca115d46ac3e845218e09bf/xaxez.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/21164247062.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/bezexatarefevizuvopokemi.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/milokivip.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162645202371893249169.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e79840a11e4ca6317c459a931480c49d/fokirinokoludoloruwe.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/domes.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077197386681---zewisug.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844eb0c39ba---xutobomonaxaxafebizuxude.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/supuxeripuzupurivoligon.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd4c586bc---gumosepugam.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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 17148 bytes
SHA-256: bfb527a9da3ed3ab5a6668d4892dcd47b1eeec3953791204dabf3a35c552b649
font_01_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 10712 bytes
SHA-256: ccd49fb3e3446c9be31829326c7b59d7d4adca3b7ae6fac8baadc0bc259ebf5d