Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55b7bab3b14ceb8…

MALICIOUS

PDF

41.5 KB Created: 2021-09-29 13:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a8e75e830764f5d8760e1e0a16c62c73 SHA-1: 88fe74f22cb5edfb99be6a8da11d13c0f2e63f10 SHA-256: c55b7bab3b14ceb8711cd3c1174829b6543925910fe89299c0057f90f04fdfe7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that uses an image-only lure, a common tactic for phishing. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7020

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://ketchas.ru/uplcv?utm_term=cory+in+the+house+watch+online PDF link annotation
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/topasuxepakuwojajutuzu.pdfIn PDF document text
    • http://lovesenergy.com/file/zixefukevuwowafevifoxa.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/mevubu.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gaputejotibepa.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/dejitewefez.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/tonud.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/45780298649.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/57940900199.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/33864608567.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfe4889ea2---zedojerelelepuga.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/xelogode.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148fb87ec691---senuwa.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/58093905997.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/37107424265.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/komokuvado.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7a33b0c9c---pesuwabelidab.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/29596572339.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/wedeveduzabusobenuv.pdfIn PDF document text
    • http://cbstav.cz/file/34488106327.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/64254549256.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de24457754---difazitilivibopozozesorun.pdfIn PDF document text
    • https://drlanda.hu/user/file/xilalodazidupoxuselixiw.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/beweko.pdfIn PDF document text

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