Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff234d3af32e37d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 00:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14748cb1105632e9d3441bc9eededf51 SHA-1: 0494179169ffac79fc76fb429e8f3ab75902f0a2 SHA-256: fff234d3af32e37d759392dd4b010057e207129f41290a2551e0c5f2f310699f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is likely intended to download and execute a second-stage payload from one of the numerous external URLs. The document's metadata and heuristics, including ClamAV detection and ML classification, strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism disguised as a utility tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://strategie-online.net/catalogue_dynamique/file/mimabo.pdf In PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/27466741027.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ac190de49d78186076d1d8cb62ee807e/51538961100.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a233c6a8f2---2906061393.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/31108720136.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/jireporekumuwin.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/75646452062.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qh6lm8novoq810bl6thub2kvr7/zalulofevomuwi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a64effe8b2d---3842600670.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b8c7aaa58223cfba696e332d778eb3f7/romepajimivezuseludotu.pdfIn PDF document text
    • https://adikmanis.com/contents/files/15185248477.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/senagob.pdfIn PDF document text
    • http://ewtch.com/upload/files/doduzemazejumudex.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/zafafoponofigonuremoze.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/99425259740.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/wufipodelusojizix.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/vizozuwamamiwixulovasu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c27bb6d95---29304942743.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/simas.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/37962954663.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/76593c7f12aa3e6e3ef3a6877d5db28e/22926473240.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nup80p6iov4liad12fonhjbq71/9668360375.pdfIn PDF document text
    • http://pnalog.ru/images/file/65357856901.pdfIn PDF document text
    • http://spiregene.com/image/files/20210820_005824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=merge+multiple+pdf+files+into+one+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00014186.bin pdf-embedded-script PDF raw stream script payload at offset 0x14186 1638 bytes
SHA-256: 8a37fb619baba2cc8a636bcc57989a5fd0d25ece526cab820727d1bba02caee3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s).
Preview script
First 1,000 lines of the extracted script
<?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d'?>
<x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='Pdftk'>
<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>

 <rdf:Description rdf:about=''
  xmlns:dc='http://purl.org/dc/elements/1.1/'
  dc:format='application/pdf'>
  <dc:creator>
   <rdf:Seq>
    <rdf:li>Xococuseyo Jebosu</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Merge multiple pdf files into one file. &lt;br&gt;&lt;center&gt;&lt;h2&gt;Merge multiple files into one file in powershell. Merge multiple files into one file</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Merge multiple pdf files into one file. &lt;br&gt;&lt;center&gt;&lt;h2&gt;Merge multiple files into one file in powershell. Merge multiple files into one file</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Merge multiple pdf files into one file</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

 <rdf:Description rdf:about=''
  xmlns:pdf='http://ns.adobe.com/pdf/1.3/'
  pdf:Producer='Pdftk'/>

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-02-15T06:42:51'
  xmp:CreatorTool='Pdftk'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='532bbe25-85f1-4e6a-9a69-7e0242ea85d7'
  xmpMM:InstanceID='453ad9c4-6164-457a-bb26-e5e9d66ae3f0'/>

 <rdf:Description rdf:about=''
  xmlns:xmpRights='http://ns.adobe.com/xap/1.0/rights/'
  xmpRights:Marked='True'/>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end='w'?>
font_00_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10772 bytes
SHA-256: ca199a7a7f286579b03ba1bc9c247e4dd6d4fe7205abb32a8746909244bead7f
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 18268 bytes
SHA-256: 56ae198a9e9d35b370800adcf4088a8e8c0bff4172a7fc40f487574d8e9fd2c7

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