Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e31f0cad7f4b328…

MALICIOUS

PDF

125.1 KB Created: 2021-07-24 07:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 595a13f2b1e69d47d36542cffb309093 SHA-1: 7a6b3aacf6f512db914f8c849072783d1d415c6c SHA-256: 5e31f0cad7f4b3285f5b50820ff6a37aef9884c3130eff3b6cf9f91559b176dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7e2c5181---90463058293.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad1d084e6f---34229513606.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/25245127723.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66313766637.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b08090834---gumojali.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ba47294e---figuvuked.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b50549b578---liwubeso.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed114ba8e---67970071658.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16089e81d151ef---lodawesunov.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/munonosukujenumomufosid.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089deb6bbb1f---sasivanixojopujoponu.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/41325144013.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608019d6ebe03---25770986927.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff07eaf96---datur.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/36878694107.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e54f30f52---lexidabe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/40203d50cbacbbff56db9577287861eb/tezafogobexupoja.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/zapokubemedipofekotagow.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/67516789482.pdfIn PDF document text
    • http://centromp.it/userfiles/files/gosor.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/jimopetoludeviro.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505041200392020.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/00559f6f73e0ffe9131b39cf8480b4d0/jazadi.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/60013125839.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c720bbb1254---70856622389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=oraciones+impersonales+gramaticales+ejemplosPDF 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_off00017f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001979d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1979D 19620 bytes
SHA-256: b822dd56a29e1fa7f274dee7847407ff5fe9d7bab8071d88a291ffb585a2c843
font_02_sfnt_off0001ca44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA44 10872 bytes
SHA-256: 00676bb47dfc41128e2c2a589bc92199d343e672b5620f0ccdbbbdfa62af4804