Malicious PDF — malware analysis report

Static analysis result for SHA-256 924804df60d64b79…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 19:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da69ba3c4900141315123ca52443caf7 SHA-1: eb22c37264754342562e33d54913f6d78f747602 SHA-256: 924804df60d64b79032cd0ce5f6bd5e4809d5bf4ce014d05c9a6e5014c714d61
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further support the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=gta+verification+app PDF link annotation
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/ladevazoxax.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210923000328.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/zipikovesixixolukufipa.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/57778245846.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/75747908866.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/giviv.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/dotowetokizuw.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6814db08b---fixotosavakoful.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/99712292725.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/89550905495.pdfIn PDF document text
    • https://posh.hr/files/24618700765.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dca495e735e13e5d1d46d2ddc5611506/tovegogedaselowajixisazif.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/puberidojegomizaleser.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/sokawewizinugumapur.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/bedabijofo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fuvepopanogizoz.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/40538272729.pdfIn PDF document text
    • http://dogable.de/userfiles/file/30069259536.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wadojukanokob.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb3bd9a1e---33362294912.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/darewomuxozagaki.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/pamirafuxamujaxisaxewo.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_off0000b6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 19320 bytes
SHA-256: 4cdc81f58f59979e7344c147109d9065652e171f973be6a63fe3bf4faf7c50fa
font_02_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10364 bytes
SHA-256: 8f67cce919711654019ce3a581abe4a588cb15dfed1c610ce1aac830f43effb6