Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39a9eed27072347…

MALICIOUS

PDF

93.3 KB Created: 2021-09-17 10:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 733fdf5ad5a032a94107acb987f8bc86 SHA-1: 828db1bcdc31b515d7675c63925c1b8521272fb3 SHA-256: e39a9eed2707234727cc0aca222f6be83a7e5b73b365a06bb802e5d391ee3562
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various disposable hosting sites, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to evade initial security scans. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/40b302897132f491415d732a127505fa/kiveguka.pdf In PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/rikilinaruzomutas.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/88689686877.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/togokefefewakodosu.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/63037301844.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/36136081416.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/31805101116.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dae426f29---74038239831.pdfIn PDF document text
    • https://akvaguru.hu/user/file/24421997301.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/44008743474.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/rusajumita.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/jewut.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/32543048040.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/45295480350.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/66145604628.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/paravinatetusovitusaremi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361ef0b2630---nufatevaxo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7ecee7ac33a1407691f99d870c3eccb2/rimepeva.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/sebam.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4c56de13b74af736a4cd21c8862fda8e/sagidajanuxe.pdfIn PDF document text
    • https://edarky.net/data/file/83561467776.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/tdv41qoo8n4tfek98ut96u7n42/82898062380.pdfIn PDF document text
    • https://rotitelor.com/contents/files/65898803318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lecteur+pps+android+gratuitPDF 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_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 19860 bytes
SHA-256: 96e3707b944def0acb3e7d76a2ad9174e51b6e4e55e7885e7f774c55a6b8f379
font_01_sfnt_off0001359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 10700 bytes
SHA-256: 11f5eb121b21f166ffaf674143c8c696c64ea7f19c551e4d42c0dfcc93cef8a1
font_02_sfnt_off00014e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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