Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33a1872a7972409…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 22:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 899c117f34dbfc5182f18cbbacebd39c SHA-1: d747ddadb2fdee337d0729ebd9cbca34f2e399d5 SHA-256: c33a1872a7972409ea4c265d5d71a82efec59c0d3f4b9b5dc297bbd36c9da3e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sewakendragroup.com/userfiles/file/61716281952.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sfi9acg32r0jn3g8kr84tjftgm/kowirenowerixerafamiwokeb.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/74146986382.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/18513617357.pdfIn PDF document text
    • http://keramann.ru/uploads/files/sukawuzoxukepeloxove.pdfIn PDF document text
    • http://slovoveri.org/userfiles/mobapaleveweparawewodas.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/29787585512.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/wedapolazi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kixulinakal.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/pifaxemexaj.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/tojer.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///28714545423.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/161c2aad1b370018b370db51d167503c/mubowitisenuzowogazukidok.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/liseweruzupivog.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/kewateponabez.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/verevujogovavuwanejojiza.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/77770180002.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/sojotejitabaxo.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/58686956134.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47c91c7ed---wifuwubokezikixo.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202193858115302.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/28542447877.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/dixofewotejeduludizigu.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/68485546751.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/62857770404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+viewer+for+pc+freePDF 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_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 20716 bytes
SHA-256: 2d3c4c79e464ea1912b7f5138b6da14e89e84ac61d46456226ac15d991d395a4
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 10188 bytes
SHA-256: cc56f749986ee22cfedc3e592fdcb9e831cf299cee570c0035c1f918e017aaa3
font_02_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1