Malicious PDF — malware analysis report

Static analysis result for SHA-256 644e38deb3b40a76…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 13:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3317242101cd5d4cdcefd2d7e07a0868 SHA-1: 00c62726318e11d4e2181e7600ba39cd1c144e24 SHA-256: 644e38deb3b40a76226f40c1588719a9bf9b196b9a8a7425f598f0c84babc7c5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites to distribute further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://zahnersatz.pl/userfiles/files/mesutuvironew.pdf In PDF document text
    • http://suacona.com/clients/16856/File/49802641403.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/iuqm3ddpq5lutu3eui4163drtb/budajedexelo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf7d034cfc---populanupakij.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/4676187406.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/sbuq74tv3qfhnp2i4b2tnb9dls/3021768020.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/tanemajidabej.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7ee54670---vuzimewuragawimuf.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/35878788848.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/66736772737.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1de5bf87---96091624008.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16093b23851cd6---58000556049.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a0186eea6d354c41635a39ff74307489/37752510134.pdfIn PDF document text
    • http://bronia.org/userfiles/file/17164395066.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/66012147074.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e060965e---wadubotiparukanetel.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/lavobadoz.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/sadumolimoderevufekoven.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/51958921119.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/juduzulisawiguwomobobelez.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4650961a63beae7293ed57f09871e3c5/jixirejowutapidumadakened.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fupikajoxudelir.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/12205556751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ready+player+one+fightPDF 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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16992 bytes
SHA-256: 3415ccc9e1b775463300b3aba295cef0dfdf7c96d210562cc91ee6ea8720c161
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13343 10768 bytes
SHA-256: 1be097a22edc76db3f53995c224523046bac27be6bbdf85a8689041b23620679

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