Malicious PDF — malware analysis report

Static analysis result for SHA-256 058c8085076e1943…

MALICIOUS

PDF

70.6 KB Created: 2021-09-12 01:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa401c43e73abe283f5bc36eb3ee40e9 SHA-1: 20a3e881eff2cf2d5d8ef0efcfc06640c13affbc SHA-256: 058c8085076e1943c104f08f42dc87998fac22c5eae8a6857fc686e4ae43f80e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to be a link farm, potentially for SEO manipulation or to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=camscanner+hd+apk+download PDF link annotation
    • http://cozycornerexpress.com/uploads/files/fumadowuxurit.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161390800a8676---zoxopi.pdfIn PDF document text
    • http://learningkey.org/userfiles/wofijodapepe.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-7/20210907235722154297.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/52839486470.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393d6debf14---91009618863.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/46976589475.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130666f877b1---61285421587.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/vimaxavox.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/47841615014.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/texetasekapanukoj.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f1bba6389670b6d0d9904d2d477457b7/16475943539.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303505e7f48---limadivoput.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/lerujaluduko.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/natoriborimoxalabamib.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/ropexopiduxuwi.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/kababadakamiligubexexon.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/vasakebatilevugegubavagoz.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/84323767242.pdfIn PDF document text
    • https://777mto.com/contents/files/gaguxaduzoxilimazenawi.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/69998656572.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210905015823.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/sotusosofeb.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/zapejafagivalegotabugos.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/xidorusonumo.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_off0000b6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E9 10796 bytes
SHA-256: 53898790d66b892f134185011771a8ad0a6f0c2b727eb6b9b0de9fa142f3129a
font_01_sfnt_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 14720 bytes
SHA-256: 32681fdacc6039fd97395edda9feccc4e6ca5cb5d4cd70a5a6b12893caafce57
font_02_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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