Malicious PDF — malware analysis report

Static analysis result for SHA-256 e866321d6c78a8eb…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 03:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e92b6288f2a04ab5ed4ce678f836d543 SHA-1: 00b31e16bbb229c293dc0d2aa9b3d041cc958ed1 SHA-256: e866321d6c78a8ebda684545839333a71493ebb6f311331a89a103e84eb57a56
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document may also instruct users to interact with the clipboard in a way that could lead to command execution, further increasing the risk. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=cistoscopia+indicaciones+pdf PDF link annotation
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/wedikoxibuminezikufekepot.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/22182116410.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/89736932666.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084129b9a451---kobakijobuvalamesexeje.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/waxawasodopikul.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c4cd098ae6f474e19c1cab7a1908c575/23101849519.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f800714cebf3dc8539e3709941d9c310/98300862785.pdfIn PDF document text
    • http://polkovnik.su/upload/file/31760337362.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d49f9b74a---53062030474.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dd64f5e88cd---piramilixaxemaxejuvizigog.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb48fd936f---33181198022.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bfa35b23a---44630763774.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b4f93acb---99365143383.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ef2022db---femumevemajuzuka.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/kakifuzogumobutubuveg.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d50006f33fea90c27ac5ab0abe0f294e/61525645268.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608712f45f192---66081266949.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/21271618388.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/72348754043.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/jezukironagizanamiwuxi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2fdd859b8---84664005086.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/63377487023.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/sivsbvqg95rjn5osc5fk3bgvco/wesidolorepevagopone.pdfIn PDF document text
    • https://tekartltd.com/upload/files/liwitizetufosalu.pdfIn PDF document text
    • 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_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 10500 bytes
SHA-256: 0920c184ddde32f6dc62b4660bb2f8057492b3e2caa0327c44ced54ffa32c093
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 17256 bytes
SHA-256: 137ac833666b50e4b54c4e21855cc20f78ce268e7ec115b1a0087948a7588ee3

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