Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51ed350f8638b38…

MALICIOUS

PDF

106.4 KB Created: 2021-08-31 10:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c5e5bd61f674fb7d2c51635a2ae2782 SHA-1: 39fa52e87649cd7c62eee07cc64ce79e5e1bb431 SHA-256: d51ed350f8638b38e4113faf52a3717a3e6de9a518e88948556fbeff93abde23
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a deceptive download button, likely to trick users into executing a secondary payload. The file also links to multiple compromised websites, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3eef0139ec40bc45576c866e24d056d4/robelituduzesija.pdf In PDF document text
    • https://funbugs.ie/files/file/22187589529.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/46203469455.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076734801691---jomax.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc877198c3---mivipeginipirepi.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/84241983315.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/10322137260.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/vatexoxuzopuj.pdfIn PDF document text
    • http://vodnik48.ru/content/file/49010901708.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/tokomedaxotivudedon.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/71845701441.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/seredakeva.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607693b06ac59---42285092652.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16106a6435d9fe---79648359878.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/11892936350.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69c0bee37---nemetulonumafe.pdfIn PDF document text
    • https://sanidom.pl/img/file/rurubeted.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608645f0cdcfc---welito.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/48290979337.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/66909862724.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110af72be218---fifesizifopetanox.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/nusukiborifibavap.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c373d9fb18c406c866b469d85982f5bc/nosafuzux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=university+of+visual+and+performing+arts+aptitude+test+2019PDF 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_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 11592 bytes
SHA-256: 5a3ee0fea07c029b87a929b31820685f290c579b99adfa77662eea4381e71cca
font_02_sfnt_off00016b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5D 18428 bytes
SHA-256: de4ab2401ffbd9343171cf4c2e1f4cf5bb6d9cec461fdf48e14074c40922791d

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