Malicious PDF — malware analysis report

Static analysis result for SHA-256 063871431d972fb8…

MALICIOUS

PDF

87.6 KB Created: 2021-08-16 15:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 61dde3b9f285a6a1de92f35acce0cce3 SHA-1: 952f5a982f74f08038c410352727a8a0bedcf14f SHA-256: 063871431d972fb8fc52e782f9fc87021ba8453d0a4678cb2754159b6cd71937
156 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 high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised CMS upload directories and disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://namthangbasaltstone.com/uploads/image/files/gazedasaxarefu.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a54ef7abc2---87647532144.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad7228327---68154019515.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/forapumepeleginurapo.pdfIn PDF document text
    • http://splogservice.ru/content/files/roril.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f0456fcb482c76c5cb8989d61f2d6d96/49801480143.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fd12d2e1e8e325fe390fab92388c63a/serasuvu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160792486e7e46---losokawakaxeva.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/t4mjr54gih9lpq4f6doj7eg0lv/jabenes.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609128a1d6742---64677146955.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/26a927781152d78098dd829d51d85c8e/87901461243.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/45221136586.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/13089013011.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/56920677350.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/29158197455.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/mibubunowimirenoferona.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9e7cf3ef---woxiteliji.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/70828623601.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/kedopi.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/xasolap.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/kesomafizivola.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/da7a80ba7a4ce82c64f84bea8668ee79/lenopugibolaxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=descargar+guerra+mundial+z+castellano+megaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 18856 bytes
SHA-256: 9388033ddc75b39ca03e90fdb7124ce7bd5b92f99f1406d5894787ca45fdd22f
font_01_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 1852 bytes
SHA-256: 7894ce70b85315a6af0017eff107d8db111df3da1f2c3411a3d74d8820d3fe9c
font_02_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001340e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340E 10876 bytes
SHA-256: 86a2db3512fc5da34e0874160c3caa43c7484bf850c7510d28a67aacdea68ca4

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