Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b89cd7b28ed1a6…

MALICIOUS

PDF

80.0 KB Created: 2021-07-08 04:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c76c7f7e44fef4b744f8c8674c88e06a SHA-1: 78c09c5cd2252fe84f0284e1004b57117e6ade58 SHA-256: e1b89cd7b28ed1a684afcdb5dcc53fdd03e381e4a27d6b7034d5f1f89b56e65e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to unknown PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd829ae7fab---xevajuwil.pdf In PDF document text
    • http://amadpich.com/userfiles/file/sajopinana.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/31783152771.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df148fcea4f---batanajawabaxef.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/vozaxuvodedemufemazemaj.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gt4b8gdlk7fpullqpvhonda2pa/72120934110.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/sumedomenakunaxidi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/cc8adfab669bbd2147b0bd0c674038dc/51799830877.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a84cb715e---89517889159.pdfIn PDF document text
    • http://firegallery.ru/img/upload/fowamini.pdfIn PDF document text
    • http://geasit.it/userfiles/files/229168476.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/parugovodugudap.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/62113697867.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3mr5mia3i88hrq9s2co349nhe0/2380696576.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080e93d07d20---kadagefinuvabi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080009a7c594---3665921815.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab2208d2e---disafukezap.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/kirabagaresujufolowom.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/42748817324.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/146f03398d52a3a868b7976fbf47a633/tajumetowaxesejawinewija.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/39204829773.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c900813494---tedivedonasu.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d4cfb8f782c52e16952c2ceedc8b75a6/33857691371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=apex+middle+homepagePDF 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_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 10452 bytes
SHA-256: c621aa4685852e5d21452383ce2f96bef81beb5dd2cb7970854b141ffd382494
font_01_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 17996 bytes
SHA-256: ddfce45da77b7afb063c46642369be2b4d4ece43bbd402614c86c4162152b151