Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ee08e50c84e6e7…

MALICIOUS

PDF

101.5 KB Created: 2021-09-03 03:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 919c5c4ceb763103671c6bf9723c3560 SHA-1: 68fd07761b4f79d82019a7ff8ca5721863fbf599 SHA-256: 16ee08e50c84e6e7c20edce1d0cc2bc434554917f16a571f3ad2e9dceddca4cb
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external resources, many of which are hosted on compromised or disposable domains. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a link farm strategy designed to obscure the ultimate destination, which is likely a malicious payload. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8324

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ehlibeytalimleri.com/resimler/files/73870958850.pdf
    • https://cytairtool.com/test/userfiles/file/20210629_17105.pdf
    • http://speed-r.com/js/upload/files/91323653296.pdf
    • https://familienbilstrup.dk/userfiles/file/gajuzelakepuvezeji.pdf
    • http://improntediteatro.it/userfiles/files/36481549345.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2b49f71d---35924652447.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be471bd2376---sofijirilenejak.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/xotim.pdf
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/pizizapiga.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/17570281392.pdf
    • https://foulardfotografando.it/file/jikaxixovaviposezokafeda.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/63197972712.pdf
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/xowiwemax.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/104f104ff8aa5cc8de473738dd117c07/59105703732.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd84c1b2a3---40369078264.pdf
    • http://ndt-tl.ru/upload/file/gebidon.pdf
    • http://erimti.com/userfiles/file/88039591209.pdf
    • https://mps-india.com/userfiles/files/80482562672.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/nafajulibasaj.pdf
    • https://inverpalmas.com/aym_image/files/97386468895.pdf
    • https://bakwanudang.com/contents/files/koture.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/rutobigomoserudogaxojovu.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/gaxoxe.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/97689793163.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mmpi-2+interpretation+worksheet

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