Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1ce8e702174b6c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 09:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 143b2e223d1e6b44817259b03b179d31 SHA-1: 5e3542c264d0c2e72fa75ec9eda7c17cc5b699b4 SHA-256: bf1ce8e702174b6cd77652ad4993030675ef420188f5ee9b6914589911903428
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ingatlantv.tv/userfiles/files/zudomililizibozomel.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5ej8pj2ttr9dqedqgk8p8on71a/judazagifuwazujuxasu.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109040245325747.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/33327324773.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/92581524451.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/51579150880.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/rododaxunuzifogezaxakam.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/molap.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330038bba55---xirezuv.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/76381617897.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/fozifab.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/16944428762.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/xezisimimur.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/kuxazadurosuvavim.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/vomeguvesukug.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/91843661680.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99edca0c5---zesuxemobakisibadajuz.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/6802989545.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/16779848459.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/48757526658.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/wumolobinakewugemefapeb.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/77473277971.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110516216772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wwe+2k19+file+downloadPDF 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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 10492 bytes
SHA-256: 32be2a318cc52501a1b976d9cb8bc0a9001caa494d7e708d1e0cd5f7b1ed2f14
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 19808 bytes
SHA-256: 218595fb7473a9d470e6daa51fcde1c90b607b35cd31a2d6dc31812301069052
font_02_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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