Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc9df4eb2e8f805…

MALICIOUS

PDF

41.2 KB Created: 2021-09-22 19:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dff12656f5672fe337183b8ca67af609 SHA-1: e60b9fc2171102ad3e04a5dff17cd69ab688900f SHA-256: 1fc9df4eb2e8f8058e28174e763fc2cec734d27bb55a14ae9f5844a7732252fb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The link farm heuristic indicates multiple links pointing to compromised CMS upload directories, suggesting a distribution method for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7348

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=sketchware+free+project PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613956edd33f3---92172807289.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/719hic6vspm985l6152mqfpo90/61256619697.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/samufoguxinuz.pdfIn PDF document text
    • http://cga82.com/admin/File/nogorajamakifase.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/zawibofat.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138077e8d327---wukola.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/sopijifojadot.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-17/images/files/95330479780.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/28789212694.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/valegijiw.pdfIn PDF document text
    • http://citty.org/images/uploads/file/69725079195.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/nopokovulune.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/wexudigor.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/4170702987.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/59352796722.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/figagitumimogufufagiri.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/78483699221.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/75811495182.pdfIn PDF document text
    • http://emannsltd.com/userfiles/82343452782.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/58548910431.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140072603f62---90948898213.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/480enhppj8d2ke59prku89h1p6/19118723937.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tabituvumamubenafabeg.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/mapuzuk.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/80781827706.pdfIn PDF document text

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