Malicious PDF — malware analysis report

Static analysis result for SHA-256 3239c9921539a664…

MALICIOUS

PDF

84.0 KB Created: 2021-09-24 01:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 34d0b3695681ffc416ebca07797a2b2a SHA-1: 7dd38b4ef8bac0367f3a703fa01d345da789cf0c SHA-256: 3239c9921539a664af80c2cff1fa8d420f7db23d02bbe89753ce99173d3cf547
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 a large number of external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_INVOICE_LURE' further suggests a phishing or scam pretext. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://condicionamentofisico.com/arquivos/file/vubujikimivu.pdf In PDF document text
    • http://altus.pl/userfiles/file/wawopadexunijatufobafa.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kgd5us24n85gfevjedlfbcq2e4/rulozakivewonojozig.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/vifodofurefukoz.pdfIn PDF document text
    • http://shosholoza.de/file/62407610054.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/24164590540.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109072314096204.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/xulinobevibemos.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/jobunokuvabagugofigaf.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cef23d9631---57711488660.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/jolizul.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/867cfbd04b598a7f177b1036f7810832/3401719481.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/40058156604.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/jabur.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/72496420415.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vimitotobebodono.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/wamemitodun.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149256cb556f---34139886402.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/datetumekozege.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fojamizubamenevidevisizab.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/borapamegilafamoragap.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/39539780764.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/45287402478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+free+budget+app+androidPDF 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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 10920 bytes
SHA-256: 4c71389ec813164f5c048a528c689c4fb73aa1aafdff296c0799cbae226cb2cd
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 17312 bytes
SHA-256: fb0c64eaaf1c2f074b8d429f6b5e3815c7fedacf30adc6441ccd3c101ec37cc3

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