Malicious PDF — malware analysis report

Static analysis result for SHA-256 23822e74e8328035…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 21:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4a99c90da038e7ab61cca7e4973c84b SHA-1: 485473422177b89c6e078c6a9cfe6eccd748c29b SHA-256: 23822e74e832803574a9f3850565782e5e17f1b0e1905c8983f4ba7eae007b76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://lanjutpt1.com/contents//files/8046074704.pdf In PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lutogavawusodirexarosuso.pdfIn PDF document text
    • http://novena99.com/uploads/files/202108180453096233.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/dumivurubagefudufo.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/muwamimonojabez.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f531ae2955---45567964878.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/zoxibudojetowez.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/58387880020.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/61360521201.pdfIn PDF document text
    • http://mosjob.ru/images/file/40620448927.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9e38e3435f92a290354f4fabceb7c16e/gufun.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/ximabureretumadigi.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/vijotenuzobifameruluz.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/38403895733.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/86946fb8b65493d0f52b76a05a680b30/10418153596.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/33734734285.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d742a8c80d---giguwebakilegiwov.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/89447539898.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/27040510414.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d7c630376---53865563065.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/43232882853.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/kijowojorud.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/71817903425.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/890a06d51c0c25cad1a372dccc1f2b40/jarubofoxuxabajeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=schaum%27s+outline+applied+physics+4th+edition+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 16372 bytes
SHA-256: 7826e7284f9c7d273f69963c963edb3fe8b6ee0a61f80073f2536ffe551ba859
font_01_sfnt_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 11184 bytes
SHA-256: 812e50d64f5eb693003db0b7ef881591732cedc105c6a90ac2b73e4d166559df
font_02_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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