Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54992ac57ee9c35…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 10:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d964a95964925e4ee0f296ad44288dfb SHA-1: f8bd0475b3cdd128522d457e070f7bdab8e09f76 SHA-256: f54992ac57ee9c3599dbda944ecf0b616b976fce4cec8552ea07fc0cc31e5333
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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
  • 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 https://ketchas.ru/uplcv?utm_term=code+for+download+pdf+file+in+html PDF link annotation
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210625225128902863b6w5ps.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4566e7d74c---vibutodaxinikov.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/repexinukukotupovozigaw.pdfIn PDF document text
    • http://boldogelet.hu/media/tubabefazul.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/jafipezilazag.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/1d59bd9a891438decdf59cf33fadd86e/34236658613.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/64047263713.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/gazazafevalevola.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/girefupabujonilu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/22dfea9777467034f12cb48befc0b5bd/ziwokokamitibadufuku.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac552470b92---waxujujutiro.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/damemazobironuru.pdfIn PDF document text
    • http://salt17.com/userfiles/files/26885059626.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/17069263946.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991bb6c8cc---63395999428.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/68598096846.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4596153a67d516df4637ef542fa8ed60/45501235922.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/38866394969.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/muwisog.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/a8fb0f6b4bc847b9f725dacbeb392278/miwalixakisiju.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///lajavikukebolojo.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/37296373773.pdfIn PDF document text
    • https://baglab.pl/galeria/file/mijipoxafuzufewufenalu.pdfIn PDF document text
    • 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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 10712 bytes
SHA-256: 0a3701df3faaf7c31c40a38bf7ee5a14c57cb04a3202beac026ef2c50b854110
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 17624 bytes
SHA-256: e433ec1b0e2608be69bb7537921b8121c0bca269c2a714261bf3347fc71e8bbf
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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