Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b99c9d2d148c77…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 06:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71eb823e9e9a16237034b3a576f717cd SHA-1: 38aa93db07a18fcb82d31ea7591d5aec8f50b719 SHA-256: f7b99c9d2d148c7797947e9d30618687f19384518755a1bded26c0b8298e6369
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The PDF structure and embedded URIs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. The presence of wkhtmltopdf metadata indicates it was generated by a tool, not a standard document editor.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4729

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://queure.ru/uplcv?utm_term=samsung+s5+recovery+booting PDF link annotation
    • http://ls12368.com/userfiles/file/rutokurifekojoveden.pdfIn PDF document text
    • http://szpk.hu/_user/file/63087206478.pdfIn PDF document text
    • https://pixel.bg/img/file/18939892744.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xiretavigezeloro.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/54992174376.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/44311028937.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/zafekapuzotizugariz.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/59905215633.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/67103538703.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1a338e0f---70804595431.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/90184656195.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/11208942964.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/99084092207.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/sodokamaweketiwixuzev.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/88593203770.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479e33a3fee---retuvitunimi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/fativizofu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/98c9bed74512c9792ff4f44af09fd29b/jizuze.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fc0c48e2---rovidowolitedowe.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/nisavefedutatalim.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/36332340399.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/55322045401.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zolidilutirul.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/mobovejumopupenijalaget.pdfIn PDF document text

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