Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f254b6bfbc151fb…

MALICIOUS

PDF

48.0 KB Created: 2021-09-18 12:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52aaef22051d09af9c2d7f372acdc151 SHA-1: 601f58b5ff73ca50348da36fe14f986b5ae35607 SHA-256: 9f254b6bfbc151fbf02cc912777b7fbab5897b922f0173e40cc06addd25267fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress uploads and other disposable hosting sites, likely to distribute malware or facilitate phishing. The presence of external URIs and the nature of the links suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7444

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=crack+photoshop+cc+2020 PDF link annotation
    • https://iword.de/userfiles/file/nunubudepevitokivuzafutin.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1d82df844bb914b29c23cef34ff62704/vixujowufofirarapoxaja.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zezowenivo.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/litebexa.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/59631731986.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/gotepepisugefejivubano.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/regabaxisixidatikibaligap.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457cbf176fd---35387508446.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/fenevusubolunulebazetone.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/88500528588.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/31355415804.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/tubarofekubadoxebawu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851555ec80---86666800242.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/3615099103.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/20191647938.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/jozinekisolubabibitif.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/16600070877.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210904_140508.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/87164583253.pdfIn PDF document text
    • http://bamila.vn/luutru/files/53824853803.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/sofekolipaxidib.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/samewegovosaxedulomujitod.pdfIn PDF document text
    • http://dasbluemchen.com/68605116057.pdfIn PDF document text
    • http://kbchina.de/upload/18891766866.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140971fe53c4---51350520329.pdfIn PDF document text

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