Malicious PDF — malware analysis report

Static analysis result for SHA-256 8225cc534b9b964d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 09:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd4bfec505e97b432e7c1880c3a4e8ff SHA-1: 3eec0e9b635eed729bfe8496271451395b43b142 SHA-256: 8225cc534b9b964d0cfe0e9b73fa0099577b0c224232ffe597a342dd81b82f69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely executes to download and execute a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://perechen-jurnalov.ru/js/ckfinder/userfiles/files/mufogilosiduwixod.pdf In PDF document text
    • http://charnafamily.com/clients/60216/File/sunojujabodizez.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tlhsihfr6vdu47bve7srm4eja3/nuwedusanixopebupimezawi.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/xofivivobag.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/davividikimil.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/pojuza.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/776878350.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ce431036---62240343580.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/pamulokul.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec408bd7e89---39235131307.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/97k62ppch3da1jis8mann958am/88413887849.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/33d71c3dqape3q6nf1jldl45m2/zozajekugedilokezejaro.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/45347267487.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/76135257205.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bfac0e08f9b9523a41bfc01d43de10e7/wezimosujusaletalekoxokud.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/45224552194.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/31661910010.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/19615356143.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12e5ed4d40---rofuxepidaj.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/39179012937.pdfIn PDF document text
    • http://kisito.com/userfiles/file/sesefijaxawuxin.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/94082442728.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46c840f26---dudanuzose.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a86a9b33ec38a4e5f16c80ccbb1efa84/49656896550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chuy%E1%BB%83n+t%E1%BB%AB+file+pdf+th%C3%A0nh+file+%E1%BA%A3nhPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 11140 bytes
SHA-256: 8ed283b481a2d778de004be67a2b6cf6d092778ebbb4a533a40be8c902235b38
font_02_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 23368 bytes
SHA-256: 09dc844fdca69e96ade4cb7c5a676553f5e855bd99406b9704b275b2a2ff6a17
font_03_sfnt_off0001315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_04_sfnt_off000146e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E4 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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