Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b778c983ef07b8…

MALICIOUS

PDF

47.7 KB Created: 2021-09-26 13:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 728278e3d3a63a36b7273d745cd6ec3a SHA-1: 533e5886ed3af9f0cb6d3b1350a30835e8a0f312 SHA-256: 66b778c983ef07b8247ae3f1555c1b9e5cb94eed3969836afadfb8d69ece2c31
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot used to hide clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various compromised websites and disposable hosting. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper or redirector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7448

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 47 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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d411f29a8a---gerejokobi.pdf In PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/1763670218.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/84402230605.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210901_F551EE726357D1B0.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/dipowezaserujiviguduwu.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/35706255544.pdfIn PDF document text
    • https://latework.cz/soubory/27119622571.pdfIn PDF document text
    • http://medrea.ru/upload/files/midadiwiradabusebegutamo.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/sezasibizomuwa.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/mipepimumawenurugiteweri.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/63154678275.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/vimoxixadeterowi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5a183e2eda2d35e03075e39b0c10855d/93647206163.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/podetatugododofe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe64fb26ec---89759269797.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/40103479468.pdfIn PDF document text
    • http://npas.ru/pic/file/wozogugijat.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/91210628471.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tojujuw.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/12402962303.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/5785784723.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/51204990410.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/siwivodamuxikebaberewa.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/93529603634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=idm+video+downloader+apk+for+pcPDF link annotation

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