Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea13bec788bd152…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 06:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d2ba94ec8f58b859962b4b9f66394655 SHA-1: 71e60c3aa1242b0e9faa8bb73402e98460e0e52f SHA-256: cea13bec788bd15267e39518c354070526f6658a7be7bdcefe00f16dcde2e2be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong likelihood of phishing or malware distribution through these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=infinity+war+comic+pdf PDF link annotation
    • https://robindayne.com/ckfinder/userfiles/files/xadubalu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491383c0f5b---65418302396.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/fomaxudibopenilok.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/kexifetuvorunalatikekove.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-5/20210905093209239708.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/jesuwofireko.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/lololoxonu.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16318331453773.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/xozezofa.pdfIn PDF document text
    • http://wych123.com/upload/files/36881165052.pdfIn PDF document text
    • http://linker-apps.com/files/xixobadezomulomafomar.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/kivujotekakoropavojim.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///49937100738.pdfIn PDF document text
    • http://katela.net/userData/board/file/rurotitubigepomut.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jevatasilusedimodo.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/wuposotimobanelikegaxerov.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///92287064683.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613be00a8b876---wugazoxuduzawatepewo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1576168330.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-07-05-50-55-60.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/49826194530.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/17962049263.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/60364469880.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/62093931904.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdad313297---lotet.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sojidinivofabuvusobizam.pdfIn PDF document text
    • http://toonesk.com/upload/86450690793.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_off0000cf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 17216 bytes
SHA-256: ec5a5ccb5089117e9e67cea8c0e55a4fb72269dfcb0edaed638f962ab223df9c
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 10588 bytes
SHA-256: bf7739fce83e76b48d134eb9f7a4d67183852829c00763495b9b06f60c37d517
font_02_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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