Malicious PDF — malware analysis report

Static analysis result for SHA-256 4988628615c4b386…

MALICIOUS

PDF

53.2 KB Created: 2021-09-17 22:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57cdcc2bec6f7668f52abe97b625cd44 SHA-1: 012a6b20ff97c25502d3527a40a23cf7b2e5ea70 SHA-256: 4988628615c4b3866f3b1469c56f54965618e0926c7c0c597db51f42a2070a70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or domains that appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to host a collection of links for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8534

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=space+flight+simulator+apk+expansion PDF link annotation
    • https://dongphuchuytai.com/upload/files/wapijiz.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/10801810057.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/sejiwokabutizirud.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/40350976328.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438d62c5a16---fapujuluniso.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/39679893870.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ae72278c764927ee0069d9ddc946a682/39940481085.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/sejel.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/betojusobimore.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/23549477303.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c50fb2795bbe4a799084e5450afe07b5/72007906782.pdfIn PDF document text
    • http://seritour.com/rsm/files/sijuvifodowuwetas.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/17797611815.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9e044479---92563271651.pdfIn PDF document text
    • http://chinahongji.com/d/files/40255077416.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/simugofi.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/81501056594.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/lejemolen.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/fobelokona.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qk3i567na0rue0qdjmbrsc3f2/tubanitumo.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/26929252221.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8e82e060---64608484649.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/76821729182.pdfIn PDF document text

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