Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0689c26370a6bb7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 12:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd9d20aa6c852a14fc69aa94420e8655 SHA-1: c7f712d78a2152978fb0f14bc82485857a515567 SHA-256: a0689c26370a6bb7c448e627e6a187004b36f7ee604b1183c1017eae2db9234b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also features a link farm pointing to numerous compromised websites, likely serving as a lure for phishing or malware distribution. The presence of embedded JavaScript and external links suggests an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5329

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=postcode+of+pasig PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf8906279a---9830513022.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/57454184799.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/kirutatoneluvuzori.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569efca4e0---30692778876.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/natepegimotidipixamok.pdfIn PDF document text
    • http://mousike.it/img_ins/files/29355356014.pdfIn PDF document text
    • https://seerupit.dk/assens/file/53690059511.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/kazodemotanasupazekige.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/jazagijevab.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xipanidipila.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/wovepefazopogu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7d2f341c---4824298030.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/gukosazekuna.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144758812931---56249346684.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/jimadugo.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lajixemajinedex.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/sudukunawomotukebuluzin.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1b4258719bf653805b10ec8003d4c1f3/kopukudebaniborowigiginos.pdfIn PDF document text
    • https://novsport.com/content/File/61475667251.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2dbd536a---57446657645.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/tineve.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb8553dd6---80609622989.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/rezufevimi.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/4746287819.pdfIn PDF document text

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