Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be397c0c3889110…

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 11:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8be30a247d7f5e0510c589ad2ffaeece SHA-1: 945379dc1d2f0a4bf2c5b6ff68d01c0b54aabe9c SHA-256: 1be397c0c3889110e8adb85d613ac28402c9d0edd79fcac312b054c720bb9c94
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites or download further payloads. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://sambelteri.com/contents//files/loneja.pdf In PDF document text
    • http://drivescuolaguida.it/userfiles/files/ribatodu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t9okfu7nkq444b3jmus21q0l5a/bomoloropo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9170c4f854f680460d33a1b45946b588/73077114445.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/vepodarixovifokinev.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e83e0d5611c---20238684299.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/sogozuduvafawiwofupapij.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/17227437064.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/rejikinobepilet.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/gepuwup.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/1341737075.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f40a5de6---18739268993.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/43orkdlan7jbhjl3ed66rhjt54/misunixedofukukutenolizu.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/52371535893.pdfIn PDF document text
    • https://alutat.com/data/file/dadegofumolawikexesopob.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/16104768978.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fda28c078ee0e4c2557b5993cf343988/15014296369.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/96bdddd9e64365ef86ce3b7657b8fcf8/wogepuferupunufadukitudu.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/4346266338.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/66507658728.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/fubekiniwi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8721d9481---27014939246.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/21350579746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=observational+study+strengths+and+weaknessesPDF 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_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 11148 bytes
SHA-256: 3d4c2a950fc505e3a36914c1a93c5c6c78c30565e7d6489bd570419afe55cb85
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 16996 bytes
SHA-256: 55b7937e361a8bdf08729c4ccef0fd733e8dd1d7098d83e34564ce3c242cd7bf
font_02_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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