Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1673c8b74a12fc…

MALICIOUS

PDF

83.1 KB Created: 2021-07-18 01:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9fcbc30064907d116262929f33b123e SHA-1: aabe79b194db9294b54c753066b725f061c9ba51 SHA-256: cb1673c8b74a12fc3d3938a3da8ebb40dddd37f59a90159cff2e71abef579bf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c39022e8---gagajikekivupow.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1d4556373bb60af5a532051882aa51e5/98111341215.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/7270631314.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/70376925027.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/6769447732.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/gmg9kvvbn8uk0etqpu7u67cqvm/15334925039.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaab358ae2---dowilisagomuwu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/of1sq46ij2a8sj6v530f9fjj62/13570925727.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ab7045ab2947f6c73f0385864f5066d6/nevaxeleguri.pdfIn PDF document text
    • http://cartolmania.it/file/xotesoz.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/12654111860e4c34f9a30c.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a545296c327---ludemepu.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/xobul.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fbe488034---11143018215.pdfIn PDF document text
    • http://jarosi.hu/files/file/mozolaginedaxiwirop.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89cf05cf6d---nevix.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/6a3e90al7n6vsp0n64npshqugk/61308113276.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3165b08f40a37fea92644a8658363dd9/derufe.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb07930c4---62257917208.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/girolakifatu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b9140482---gururoxetevegumoranezi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160beaa2b0ca86---80539660459.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b0020c89---95647242369.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/lebiwibako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+crucible+lesson+plansPDF 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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 10576 bytes
SHA-256: ee27339243fbf4463d57fbe46faade2a4fa47ed5771f58211c280c4327487560
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 16508 bytes
SHA-256: 1a161052edfe334a1cf44e9484f6bc0c16d38b9f5eda3ac533ab10dfcc5025c3
font_02_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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