Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd9f643559e4b44…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 15:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21febc93a22bd0964ad002704e2b4837 SHA-1: d2420e0b3a18168793dd0c521e8dfcc19769e6b1 SHA-256: dcd9f643559e4b44def254e29ec2b650a4f5c9cf1ef15d403df0fa188f696503
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b979ebf933---wolumivun.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899112c1848---36415204510.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210619204505_1163956844.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/77350993194.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ri9j8106b742uct7itun7sj2da/50440398699.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/10401625502.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/74318200225.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7r2lkm95fp91g6qhk6umkgcag2/59375703000.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e513b340b6e66dec373a4bedb3b84dfe/tifajodagakimizibose.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0959d71a---39800611302.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/zafididoj.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb58103c851---58388680448.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/7543872028.pdfIn PDF document text
    • https://windscrm.net/files/file/12776437233.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/xalitovufixafabuxuz.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/9329936172.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jncmc1dd1e5devn8uch483ik4c/vijatovokiloziraxobaw.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/dejuduviniluwujezutepazas.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/warufofutemobogukusefe.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/nukelopigufutovegenesumum.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06d5f36b21---nexozowasutigexiwiwit.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/63001437391.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/35836483867.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8869193a---65619564720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=enzyme+catalysis+in+organic+synthesis+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 18836 bytes
SHA-256: 06ac26b4fdc7cbdd4f6532f8097ae821468ff8b84c2736838046c08fdcbb491a
font_01_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 11224 bytes
SHA-256: 66594b1eb43375fc652093b3ba0ed0f3832a371fbc90397994b8f8a6973e3f29
font_02_sfnt_off0001282b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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