Malicious PDF — malware analysis report

Static analysis result for SHA-256 403e2dc56adb9699…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 03:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4c58496daa44002d3cadf7215cd69dc SHA-1: 54803f1fbece193bf3f9ddab2e69b3b627631737 SHA-256: 403e2dc56adb96991c361f3b3ffdb8c9a85caa766a1bd43d8f35d7b52b6243e6
164 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The presence of a 'download button' heuristic further suggests a lure to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dac8bdcdf---74345899422.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/vugowavit.pdf
    • http://www.ecvbrass.ch/user/web/file/wimulexugowaz.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7a8f38467---84548378269.pdf
    • http://charivne.info/images/file/gironaralejiporex.pdf
    • http://studiotravenzolo.it/userfiles/files/66603161922.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f1df124a8---84681478890.pdf
    • https://mimpishiodua.com/contents//files/67386041823.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609847e139a94---52445509962.pdf
    • http://ahcxdq.com/uploads/file/110538167671.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd02f7fa44---9879365676.pdf
    • http://mini-garden.ru/userfiles/file/89100795604.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbe1daefa---puvajefijivexufuwekof.pdf
    • http://musikpark-live.de/userfiles/file/80462516071.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160701409435cb---fududonedanobegof.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/aj45givb4f7chph8asl5h9saka/76157566328.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/39709350514.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c53c0927---2553169083.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c623e9879f---60827483887.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/9natlfi5skj0vr9smuk6u1v3gl/28512212732.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e1c6cd7af18c5b7981b4f7e2bc50788b/32091127049.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f965dddff---91771644876.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab96da1c6---revowapubuxed.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qb3m43fbkcb7ftdv83b3kn1gvs/95660218317.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=view+private+instagram+without+human+verification+2019
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8e.bin
02ddfd2a0352a28c189e235dda008fd4475b6e33c34e7cd8a558710fb0bebd75
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 11564 bytes
font_01_sfnt_off00010606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 16792 bytes
font_02_sfnt_off00011e18.bin
475a11ef95e5efa0cc5a6108bcc82d4ebf0d7750e69f82dbb8d102ecc7f2515d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 17764 bytes