Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4aeed4e91c1cb2…

MALICIOUS

PDF

65.1 KB Created: 2021-09-09 12:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d595d111bcc760ff44810ca87439734b SHA-1: d363d677c09625402ce79b121838126bcfb097ff SHA-256: cd4aeed4e91c1cb2660f429922ff36580d8b5f06cb64e4b9720da949fdb8fdab
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

Heuristics 6

  • 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.
  • 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 http://okmarin.ru/userfiles/file/82435672061.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161391e66e26f4---94115706803.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/giketorir.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613182ee25084---kupulaxevopedutaniwesipe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b114c5fb2---69990145827.pdfIn PDF document text
    • http://it-hair.com/userfiles/zuwanugurekifux.pdfIn PDF document text
    • http://flomojapan.com/upload/files/wugutus.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/xesumalukewuvozerini.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dl16gdcgjchqfntb6t4nvsnrv3/37468772268.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/18979416964.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/22045681330.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/32798609045.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/powurexumuxojejo.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/44552691261385ce8030e5.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/59126162124.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/01/kozozukigazafe.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dafudebarizijusu.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/lifurerepobojoba.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/37821927396.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/70655149692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=full+cast+of+clash+of+the+titansPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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