Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12bf96dc5085d35…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 08:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53c425daa34b0cb9b4a248de170d05e5 SHA-1: fa3da8826948bba991ada5350451abe5d8ae5f8c SHA-256: b12bf96dc5085d354b39e6f52ca8410ebe0c299f6db34904bdf5a3df7304b675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r3l4tafa621r50taavbs4c6442/vavumeke.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608291ee45977---93849449800.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ke1d6kmnu4esfsesdc7au2kdtg/kazupodopotudabavu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b31c22b83a8---lutoz.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/75214ab8d5d6339ca7aff1189029bb0f/76330801320.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/bafufofosofonurot.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/13503850170.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/bisesejejaruresikepapopa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o0nara80fmbqdu0qhco0jv0orq/20835473745.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609eae16e9fe9---bixigodumutaxagozod.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/281cebc6b760e69e378ff4fe513f5f34/37636075515.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/99899210798.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/el52qt5c51lri035ucup0ukvjo/xuwuzusidutanuse.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/bedinesukobonudujo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/12d133d56a4ab0422e2a6dc32ef40138/saloxom.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/10572169561.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/kaduwas.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9e6404e86a002e016c167a4e6158d67f/20746501351.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/dfd9219b8424e8b86187ccc2f1ffc44b/susimugifolun.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/fi81ptu24c3hvifs47na0rf63g/kabebu.pdfIn PDF document text
    • http://lblussana.it/images/file/92242474899.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b3bbe22fce105f822b52764232f99a8c/3209272050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=home+appliance+control+using+android+application+project+pdfPDF 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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 11184 bytes
SHA-256: 87d14927c141e10d5c2b66376cb5c07886ad5896d5f0baa0d6ce1e27414c38e4
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16872 bytes
SHA-256: 6a90202b35e236fb7b0ab0d5e8ce113e17d83309c7210211f8e4b66d9c1778ac

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