Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88bfd34115605d5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 15:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 551ab3342553a2142031df7b80882c1f SHA-1: afb53e8c351614ffa4e721557e48aea9e751437a SHA-256: d88bfd34115605d5a825343d64160307937a2350321d0e70114349809b1638f7
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple compromised WordPress sites and disposable domains. These links are likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9758

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 http://malbreil.com/userfiles/file/venubew.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607991752f44a---96856621147.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609300d30c2a9---40530663729.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba9464143---zajew.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/47204335840.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/kupunusagomuzatenikosabij.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/86404564469.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/25696653425.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jejamubidalevuj.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160775c1108ea5---zopigidagakimegomewa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc55c85670---diworizejebutigizolizif.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c864c54600---89068961471.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/refizobutojapitodorugibi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16082252267111---rugidivefufepikumuworoji.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/3ukt6rlgb16ke8v0km8iaftq5n/86420139006.pdfIn PDF document text
    • https://le27.fr/docs/file/wumoguzugirekef.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00d217332---87961047690.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d0668c3ae6e1dc62cbf80880cd7e47c2/25804247264.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c05a536e---sexaxe.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b396c6d8eb---78929285119.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a9439a7d---lerilesuvef.pdfIn PDF document text
    • http://christopherdallo.com/file/miforo.pdfIn PDF document text
    • https://soechi.net/userfiles/file/50340268630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=annals+of+medicine+and+medical+researchPDF link annotation

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