Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bfaecd57ad94a9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 03:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94b3101cd0a3625c80b00dfbc1595ec7 SHA-1: ce28d84ee89519035671cb71b9bb29bed717c7af SHA-256: 76bfaecd57ad94a9036bf3182494a57b0ba8d6cd5327663809ab0e873c9d02a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF viewers or delivering malicious content. Several heuristics indicate the presence of link farms pointing to compromised websites, suggesting an attempt to redirect users to malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://szpk.hu/_user/file/zetomi.pdf In PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/29817369071.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070706477762---19444939340.pdfIn PDF document text
    • http://airfa.it/userfiles/file/10942825692.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/70853525166.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/ridovar.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/m8a2c9eo3u98tsmukhko69koc4/42961611887.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/julekeni.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/46604145563.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210727_111615AB8C36FE01.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/11076213015.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062512524880554.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/dotadareludapujugar.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/vetiwe.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7d349c8b54efef165bcdc341747bd54b/befojarapones.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/bogijeralupanufamepapa.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095816f2ae0c---74998240317.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/28358355190.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/jufasogu.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/6036027104.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3601cc4f8---ratixezemod.pdfIn PDF document text
    • https://maria-galland.ru/files/file/13810587519.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/46177170345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=que+es+la+purpura+trombocitopenica+idiopatica+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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 19012 bytes
SHA-256: ba797f9149c2e4db8795ff9347c5fdfc556aed18fcb422c39d5bafd258e2ee3e
font_01_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 11080 bytes
SHA-256: a6df6ae53fd38831c4a2b2dd5fc1f8a8d33d0a9203b57c560c895171750cf42c
font_02_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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