Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf3cf1ff6de789f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 15:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40180bab7df6d29542a73d4edc1f8362 SHA-1: 59bc0bcc3fbb42c9d4dd603ce66d623e0d9c0543 SHA-256: bdf3cf1ff6de789ff140d27f3708643b55d16ea91962ae98652a2b3061f9df16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of a PDF vulnerability to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pincailight.com/zk/UploadFile/file/2021080208355773499.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6835d7c56c9e8cafec9737ab8e1eff50/mololo.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/21210378545.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/jta6pm7rd65u2r4q9o6uv11suu/lubanulu.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/69140328606.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/92231179719.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vidavuzop.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/14750993065.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a257673b9cf---52078228647.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/waxapuwam.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/27121534957.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/64842360423.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/wakidizutasuro.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/49768423754.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/71215402669.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/58739093983.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/39481646998.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kivirudozorumufepubafi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814500a47c8---45056155757.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a0cb82745---lofejebobovogamubu.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/notosokok.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/97818155031.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/aoubqqvn5fg23d0jma65edlh9t/vusenuxesi.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/wunanikek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=management+accounting+tutorial+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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 10888 bytes
SHA-256: e956e5b6435b22036156f85e829eb1d9316b0179448a65c03fda332a1e151ccd
font_02_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 16876 bytes
SHA-256: 310a2026fd9f0d0e846315b8d05c50252f8c130bd2f32d1ba901751a9f318f21

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