Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c4088cea49a71e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 13:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1761484d464178e5e6e53fba24c7f03 SHA-1: 6baa0d54fdbbcfe5dafe2cb9e6fc703bc869713e SHA-256: 74c4088cea49a71ebdbdb23838bb9a82edc13a889b4e16e5069986a02bbb39a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=aspek+lingkungan+dalam+studi+kelayakan+bisnis+pdf PDF link annotation
    • https://rachelrom.com/rescontent/file/welixotadimo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075348d490d9---gojagidugifu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c8fa39c3---kigavebuxunomumerimila.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/tededova.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/d3uu88pdl9gjn7lo3b8avqka7o/34440380113.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/jorezinuwofexu.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1694884908dc4464f2b3c4218efbacbe/setegoboxefatezibalejose.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fa3c24bc8---rexifidu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16111b4105b1f8---lorugumaxevazowowuf.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45592153031.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607192b0e6dea---51661569304.pdfIn PDF document text
    • https://hirurgija.me//files/24337711348.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904173714585342.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/8158847560.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1244096d---sogimazelodeniwutufi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac143f70d17---87362089849.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/53950185667.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/wimibeparojosixifapilon.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/83751319274.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a8d83dde645aa30813fd412224d34a7a/95204985493.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/9836281263.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/71486294768.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/97729011737.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c948ec1950---vivusedixuro.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/felaboropaxikosuza.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/59034214012.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_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 11048 bytes
SHA-256: 6635020725866b1f0724575688fc704f34713a4e5be01b6073200097efd3d996
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 15976 bytes
SHA-256: 63467e13db19fc8867bbb3f4672491e44134694bef7c24952881b8a18db941ef
font_02_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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