Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d493e7607b9f07d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 03:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b80691d535225fc1cce0704b81127e70 SHA-1: 541579f1ef6ce59f8ad2841e64d65b3aaa09587c SHA-256: 0d493e7607b9f07d71d0851e3fa2c4a8e429cdc5adf4ad081264212ccaaa52b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristics indicate the JavaScript likely redirects to external URLs, some of which are hosted on compromised CMS upload storage or disposable domains, suggesting a phishing or malware distribution scheme. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.yoko-ono.be/images/userfiles/file/31327893124.pdf In PDF document text
    • http://ihanzao.com/userfiles/file/20210908120651_1059896328.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/moniwadakodareju.pdfIn PDF document text
    • https://shunnasato.com/37522884534.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/jokisalupifibuwilanube.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/jemogediki.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/bixesakuvixixedopux.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/tixuwolejeton.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/10404632779.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe7043d2---43057725589.pdfIn PDF document text
    • http://sakem.org/userfiles/files/19058588405.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/punog.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/ligazifowamupukunawegej.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/sazawidijokojakot.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/kuteto.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/98029465539.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409ecce58c---fetipolekowixofap.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///bepazo.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/wisasowujuvuz.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/renipanuligojexet.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/35381413797.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146e5fdee0fb---vabosifaraw.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161416430140a8---66351155702.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/zukixeziselosodotajafoti.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/29917980496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tutu+helper+appPDF 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_off0000b6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D2 18680 bytes
SHA-256: 899b73bead89059c659fee4279203250716db01c7571dadae7c432a7c49648c0
font_01_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 9928 bytes
SHA-256: 11172c23f8611ef4650baf9b91161f02a1c36b21c984bb0e666e9aab021850fb

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