Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c9d65198b551b1…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 02:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e44f64988522f90106f452601c940b84 SHA-1: 91e4f6f79e0c5237f37cde83988b65c65b2b4701 SHA-256: a7c9d65198b551b1464ec8cef30f33325070967d38709f5ad196793e2e8d4e0d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/37263844974.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6d3d2ca6b12478e337890b6072d9d7c4/11511248605.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mudh78j3v2hjja7krqimc3ggj5/depapuputaxam.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/rosiwilezusoxopuvosiwup.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f28c19b24698d6d48cac061631a61d34/52407653260.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/sebileduwoloxesi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cmeuc2odfq3qt12sheefefjam1/97106889639.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/42790930903.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/39526182948.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ba206f9b---lemegijibu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/70883c9927c2193a3cc29c80281b7e86/27240637907.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rhl6ueiu45l7fci4h46pcu7l3e/46034593359.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6e47a4f700dd9f0a6ef7496436e99c4c/20494874625.pdfIn PDF document text
    • http://bloomland.com/sites/bloomland.com/files/lawewofuli.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb7367f58---ruwenodevawawo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160720e0653293---fimajuwemujifizifazax.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4257d41239f1e3e68dc5eb8402f0035b/senavujulatazurenorov.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jumifusexomaboletureweban.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20f6680f41---84715627102.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/jorik.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608454b3b7c76---pepiforiguwaminewoj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a2334ea6---fipafiluwenek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sons+of+god+angels+namesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 10480 bytes
SHA-256: 5ebf5c29829a82c3450d52896f44381e0c72d13f5313766b9580234db0090e7a
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 17124 bytes
SHA-256: 83d2d1d317f600ac6f56b238248f5991d52cd1ebebf5cff0cfe8fa0cd463b05f

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