Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acc6cdbed3c3049…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 01:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6983b37127b8726544a90864fbc1148 SHA-1: 1d8d5a6f31e2b33e75cf78b5c4fd91b20b18dbfc SHA-256: 4acc6cdbed3c3049ac24331d7b6bf6f4e76cc7cc3e4058dee4654af10209528f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=postal+code+of+west+rembo+makati+city PDF link annotation
    • https://nirvanaegitimpaket.com/calisma2/files/uploads/nofelokopobop.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/93218569398.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107281658034219.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/tekuwubasobujino.pdfIn PDF document text
    • http://banquat.com/userfiles/files/daxeparusufulasiw.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/rorurixab.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e8849828---86459587314.pdfIn PDF document text
    • https://silga.ca/userfiles/file/kawejefedoteduwasovadeze.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/xobawutujapekinolakixodaz.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a4e69dcb84ffac2b9cbb5cad9318f765/luxanavipenuxememewaxe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ab3738a1b---terisok.pdfIn PDF document text
    • https://avenue102.com/uploads/file/porezeperiwufeto.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9b4a68e55903630d2ea0b92128bdae36/lepegaposudona.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/fejajolinopavovunibotezoz.pdfIn PDF document text
    • http://budka39.ru/files/93933404753.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/gujigeduxumesabapejen.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/davilebitipefu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d66ff784f3f---85851412870.pdfIn PDF document text
    • http://classtool.info/upload/files/52790777066.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c56009b19f14f24bead92cb6dea076ed/62170457471.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/winakuka.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/mijelizexunixenomojedixod.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_off0000bf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 17960 bytes
SHA-256: e83f9b344397bfa20b00657072fe2d32d2c49457797a4b0496f5f3147f3a89ba
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 10964 bytes
SHA-256: fb9ad2bc253f7a57ed67681b6b8a3f95afb156d8e90d7c03727e053a45cb1fd4
font_02_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.