Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabcc97eeec6134d…

MALICIOUS

PDF

88.1 KB Created: 2021-07-26 06:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e11226a9cd78a56febf6f712ba62939 SHA-1: a56a58f5972606790305a2d2c007503b833a52ee SHA-256: cabcc97eeec6134d579dafbc6f42ddaaf789c02982e232d26041f56716b6fa1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URI heuristics and the overall structure indicate an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://thegioioto.store/upload/files/zunegagajalugozupox.pdf In PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7f765c240ecbcd2a3a7f0cc4ca83faec/10343606829.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e10ec1008---64364876114.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/13739622080.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18001dd1e---vejolegapowetufijopoxu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ffeed16f---sopapitusozez.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a92b6c3161---50117214750.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021070516140258.pdfIn PDF document text
    • https://mcitalianwine.com/file/49661195840.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982bf91c2bd---vaped.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xinagoxutotudo.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/19568786997.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/602bef0def651d96a6de4989c228153a/gomijosukilosig.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fbce2902b85---xorajagawibeselotanelo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5465d209---28338413232.pdfIn PDF document text
    • https://webmenuplus.com/images/file/72222398606.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf1b647c22---gotojupataber.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5e904f0deb510654fbd42a1a45d563ea/pekikiwataso.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/viduvobolaliful.pdfIn PDF document text
    • http://chinahongji.com/d/files/kinutokekowoxetitajas.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ddc29aec---dazamuto.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/latubupujosenokekusutegeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=british+gas+bill+sample+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/134033ab36682227e7e39447d6c25a6a/wotixuzelafekutivivisefis.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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 17888 bytes
SHA-256: df20fd38d1f6d9243f1dfaf6179bd0a1ff68c8c987eaa4e83649f2f5b860dad3
font_01_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001373a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373A 10912 bytes
SHA-256: db5c90aed679d9d22ff6961e46c2f8c40f29935b7341f6a7461c1edcb0e051e1

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