Malicious PDF — malware analysis report

Static analysis result for SHA-256 54405ea9a71ec36a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 19:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e78ab4ccd9da025006d7aa30fa431fe SHA-1: 03258e9904e255fa586745539dd0fa144f2d9ca3 SHA-256: 54405ea9a71ec36ad0f8860cad17b7e0132e8e4e7770f13e6d188736756381d8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous links to potentially compromised websites, indicating a phishing or malware distribution attempt. The file's structure suggests it acts as a link farm, directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.cddfct.com/up_files/file/7381192928.pdf In PDF document text
    • http://yourbuilding.ru/userfiles/files/pevivimuxegexiludiw.pdfIn PDF document text
    • http://amdind.com/userfiles/file/marajuvebadudotuvodaf.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8a41b3d68b6b574947745c0dab96d9b4/37368382319.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/titavozu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/eroqqj6s4mavipo4eo9tmf8e72/85816961871.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xozepivasikofafozib.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c6609f71e---40270239630.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210728_3E7B8C16A52A3053.pdfIn PDF document text
    • http://garderoba.sk/images/_file/325318639.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721446680de---vonunemufefetumome.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/durekaxefilugilo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ae2523635aa---kirofurekir.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/disapexilesajavop.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/lexodus.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/gedufaleludo.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/16316064965.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/welitivuvebapiruv.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/tegosikulotokokamofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=homelite+electric+log+splitter+manualPDF 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_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 18124 bytes
SHA-256: e0b91c0ef67766257f4e214d89c9227f1a266c9bb618dc3c8c99de446adb7712
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10808 bytes
SHA-256: aa28dd03c81c072ad68aaed1fdaa25b5f2a8c58894e8f917ce08eb86d21329f5
font_02_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1