Malicious PDF — malware analysis report

Static analysis result for SHA-256 2caf3cd45f9d8c52…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 19:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4063f29f23c8b2f9a4777acb66124cc SHA-1: 5f2a87917438eaee9e0942e82c087156dfe1926f SHA-256: 2caf3cd45f9d8c527225521be0c14485d991725caa712658ed5cdab74750eb9c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript script that appears to be part of a link farm designed to redirect users to malicious content. The script's metadata and the file's heuristics indicate it is intended to trick users into downloading further malicious payloads, likely related to the "Learn powershell toolmaking in a month of lunches pdf download" lure. The presence of multiple compromised CMS upload links and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • 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://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/turefaxu.pdf In PDF document text
    • http://planbmedia.hufiles/18552264079.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/4332876687.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/93d72dd5975bf651c8cb4ced04bebfb0/39743292551.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/litixafeselor.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608745df2edc9---82067936317.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/rilejan.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/98354473240.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0e3a2c0e---pitugedimavebuwo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/vm33hgk41q5kc79bff47ut0sff/zagojirovaririlojiso.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/tufawudomifafa.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/11520569167.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/fegovejafegedaf.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/xefemininowifudomu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ao2aa32o0ck7tq06ltfn5bvsf3/labobosobetek.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/pevamudageruweruzulolexas.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/4951750095.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b274a3a436fb4b08ee34c98a31f5f06e/mexulikesomafugamaxu.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gizobon.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4f11ce633af95e001a7e19ee3888e8a4/nozuximimudokewuxix.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/jezetitoputikalo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868ecfd65e1---jazuvuzevinow.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/29560406801.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091183c1781e---pasidogapitolivopogoxej.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/boxigasoxumadum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=learn+powershell+toolmaking+in+a+month+of+lunches+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00013d50.bin pdf-embedded-script PDF raw stream script payload at offset 0x13D50 1762 bytes
SHA-256: 5c19d5819506605b0f4f0fdf9074b44d027d7d5133e40c64d01c674fd83932b5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 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='Nitro PDF'>
<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>Colaka Vahirehi</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Learn powershell toolmaking in a month of lunches pdf download. &lt;br&gt;&lt;center&gt;&lt;h2&gt;Learn powershell toolmaking in a month of lunches pdf download. &lt;/h2&gt;&lt;/center&gt;&lt;br&gt;&lt;b</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Learn powershell toolmaking in a month of lunches pdf download. &lt;br&gt;&lt;center&gt;&lt;h2&gt;Learn powershell toolmaking in a month of lunches pdf download. &lt;/h2&gt;&lt;/center&gt;&lt;br&gt;&lt;b</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Learn powershell toolmaking in a month of lunches pdf download</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

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

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-02-09T07:53:56'
  xmp:CreatorTool='Nitro PDF'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='ee5fc5eb-b5cf-48ba-9150-cc6bf4c4bb1d'
  xmpMM:InstanceID='386f5a8d-7f1b-4f62-9d2e-d2c310114c8e'/>

 <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_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 17300 bytes
SHA-256: 3206f178477a4a5a7af824b5337455b1c82ee23b015a182061f635a7c701fb46
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 11304 bytes
SHA-256: 7edc20817965356895c8887e4333cb58cc3f28adc8fa146bb9829cbd54e91c40

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