Malicious PDF — malware analysis report

Static analysis result for SHA-256 53860637164cd748…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 12:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9575e55159aecbada8e56b454e6658ef SHA-1: 7e0c070b20c0e813423c124590c9694a5beaed01 SHA-256: 53860637164cd7484f16144908267c0161a38579065e2efcb81512fa210db972
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The 'SE_CLOUD_DOC_LURE' heuristic and the presence of numerous links to potentially compromised websites suggest a phishing or credential harvesting attempt, impersonating cloud document services. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/49473963352.pdf In PDF document text
    • https://novitas.ro/files/zoxofuralovenopogikes.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/netemomulumoza.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/94179317636.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sedowetorabikul.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3bfe1ccd6---81667530518.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/zidabajafijajurixutiw.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/tijonemediwisoleru.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/paladotokokujefa.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/tawisopajudirovamef.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/74633632214.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/miwuniwibiroxiva.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/80420632947.pdfIn PDF document text
    • https://negaratoto.com/contents/files/pixerawanege.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ajpto12enn4l2aklpc49f35p8e/zokudur.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/59990392131.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wivufuduvurasilomasaziw.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qt90tnnf2qc0o78nkbf0lntr6q/wekuxilexinozofogoni.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/nipawojuguwelezaxos.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6861c24a07a721c3d4e205e85d162c3e/nibepusudebutuj.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210912_ADE9F7AA45DE945C.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/samazerifajasamuf.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/leniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=onedrive+live+sign+inPDF 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_off0000bf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5A 16156 bytes
SHA-256: 8bda575fb4fe33302663bafa48650f914340241d9774473c1912fca62add9e29
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10136 bytes
SHA-256: a29b52966e509c371cc8150ff53d643ecda5cf9acbd4e6061fa6e7bd91606659
font_02_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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