Malicious PDF — malware analysis report

Static analysis result for SHA-256 560aa84555a09ec6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 12:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 725ae27730333c78b328b8d16123f281 SHA-1: bc0bfe62b8a8eba7f5c5717b717697405465c824 SHA-256: 560aa84555a09ec6bce286c13c7b78a84ad07e802aa7579fce5d0738c6e38fbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=sniper+assassin+android PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384b10708a5---61588398737.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/gebenajedexu.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/25283446302.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/zekisutuzowo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/decf6b86b4d4edd590c9bb21e6fd871a/pulunekafuviporemofudif.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/89093070360.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/22847483834.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/50084451659.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135facf448a9---xiruxigajunadujitik.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/dofezefidekokogul.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/kodupizapina.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/26787747401.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb936e390---28711153559.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386d191d32d---65739419630.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/nufolibegenegaxavos.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/bazon.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e31ae30389f8cb054280c068641b2d24/98164623273.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/52199245183.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/kaxetada.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/18440657946.pdfIn PDF document text
    • https://thehouseproduction.net/file/96840678812.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/17886935685.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/pojopamafopikol.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/49130669435.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/logomeg.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_off0000b833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB833 10316 bytes
SHA-256: 437c9ba1c02dc99aa5ef7687c03c3a1d5f76d321f1e4a264a424e404e9a95f88
font_01_sfnt_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 18996 bytes
SHA-256: b9a0ce5aa81729c56e4cd64576f0d924b267bb2a5cfe882121bcdd75d80d9265

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