Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a4b0739eb516de…

MALICIOUS

PDF

47.6 KB Created: 2021-09-02 06:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a9a6f065adcfcf13d1a028f7f5eafc0 SHA-1: 1c87f795f642466ab94bbd2162cf16a1a7147be8 SHA-256: b9a4b0739eb516de277e68f8c44f3f8b38b166a5f73cb2aa8a9fba94d8b422a1
154 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs further support the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8587

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://catamma.ru/uplcv?utm_term=she+broke+up+with+me+but+still+wants+to+be+friends PDF link annotation
    • http://midel.me/userfiles/file/nedozoperijofufonatikago.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/rijofonarovusazesatazaja.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f447def9---monipobazijadufe.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b070cdc1e1---vejerivozexe.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7c4hml6oneqbs62st9q2g91uef/dajegididadofoko.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/po33q3nvf90okpev55oht9o4ri/didezagado.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9f38b7fc4bec2c445d25140c975b7f/dogef.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608763c66e1bc---kanuwidipugojukaf.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/69249862573.pdfIn PDF document text
    • http://gptools.net/userfiles/file/6299289395.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/sefafarexagotelol.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/46917847285.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb01b36511---funafamesavejijigisujuk.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608516ace0dca---ferorotikalub.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bbf3152ef---3474149483.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d7802be4---28407668858.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091301a00b7a---37559049937.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/75143232002.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0619d773---15777449088.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/35511318503.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/vowevud.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/86pl980a5f521kkuta8g76n327/73964325755.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cldrd931t47rjak5io45pqi79j/nilogumeda.pdfIn PDF document text

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