Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d8da08990ee8da…

MALICIOUS

PDF

86.7 KB Created: 2021-06-14 06:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 652198d368ceba8066abe748836f8c01 SHA-1: 3974e1681923ff8c6194392e1640277dd5e2c959 SHA-256: 27d8da08990ee8dad684cfa43ba6d50b136f79c3acb3f5dcb1dbc07f8c519263
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users to malicious content, potentially disguised as a movie download. The presence of embedded URLs and the overall structure indicate an attempt to exploit user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=twilight+1+full+movie+eng+sub
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e6542375cbfee4bac246728d226b0559/koxugosuze.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609515d117f28---loselimaluv.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dcbkiq4c4gdp2ak4l2fo5c5ubq/69161124715.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/885flg4g4e15vo0arg1mhknato/52900416481.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07293f6e0---rifogutetu.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ea3e73b7ba0d57ebf6124a510da37464/81697788595.pdf
    • http://selfmadefilms.nl/userfiles/files/sosesovojugop.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/vaferopofek.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6a50eb0f---fizewemitedaweka.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079b27f77957---ruresezajamososudokez.pdf
    • http://innovatepc.com/userfiles/file/11644568475.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7irhvhgurqnvofj1rpqaka1dcj/76648692454.pdf
    • https://alarrabnews.com/images/content/content/file/toteb.pdf
    • http://monkey-do.net/userfiles/file/99255148848.pdf
    • https://corghialberti.it/file/xobubemilugafovagar.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/5d838703e9324ca002c5c8800d64d118/78082128565.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/35957392950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001076d.bin
351fb5ea995b029da184d40e986fc6e9ddba9217deef7a8e7377a113462f9945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 5168 bytes
font_01_sfnt_off00011909.bin
178c311b228c4d5665abf1f0ad182f2ad05ded3e51907d9442973173a2913c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 21684 bytes

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