Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff51435c34f1563…

MALICIOUS

PDF

41.6 KB Created: 2021-09-14 11:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8d9634783ef71a069a55bc6c484439a SHA-1: 72f14eb842d5c8a5f296b5c0c0508557fa32e1f1 SHA-256: eff51435c34f15638e3dcca4e88dc55aab7a951c9ba9d1c411b725f52843617b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The PDF structure and heuristics indicate it's designed to appear as an image, hiding clickable elements that likely lead to the URLs listed in the IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7092

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://pistant.ru/uplcv?utm_term=my+find+android PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f717e253e---rorukimenetoninigiresiki.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zuzokinamoniruwonitos.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/jibixajeluwanogi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f817b1b9---60632162027.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/mupezoraz.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/vafafisu.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/banuborigovetoleridir.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/69431036452.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/53674008663.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/gowideduraxeluvusodavebi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b345a41706---walefivumebivemed.pdfIn PDF document text
    • https://apra.pl/files/file/67612236763.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/tamasibiwiminiw.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/22681269578.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161398767b178c---kodupalujijoxosifikatat.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/mikufilorowu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/86376339638.pdfIn PDF document text
    • http://terrietanaka.com/library/files/29983117274.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613862df8721c---zitasidi.pdfIn PDF document text
    • http://chikatere.com/Upload/files/wifadefokogiwofi.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/84479418470.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbc998469---lajozexukaruvukaketa.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zemipudufu.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/piwaxawigalosakoxe.pdfIn PDF document text

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