Malicious PDF — malware analysis report

Static analysis result for SHA-256 68694fda09799f64…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 07:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4449df52c3b588030ee96d809311d3c7 SHA-1: b0961830f9864f69ec77811f5a4c09456a40d523 SHA-256: 68694fda09799f64163ce0fc6263e977d2aa3fce61e0fa9ead09f6b139f7539d
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of external URI heuristics further supports its suspicious nature. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://cc-loges.com/uploads/file/20176392114.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d788928c2f4---jegamevu.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/60957341636.pdfIn PDF document text
    • http://k1a.ru/images/files/file/navasemusiwiparufowafo.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/56281977660.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160739892bfee8---81706087846.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/67995873248.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160933a7186d3c---zogemogudafedinifavov.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/85d55e361d4a15776326374ed7909e1f/40352434634.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/ralaralelujepepupixod.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/46729218260.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/devuneg.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c145daecb99---kugulatake.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/46406773624.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8f9e639ff6c5a60bdc18c72326c16396/51481272148.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/45185019988.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/pizidate.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/jotevubaburaredolepu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3327133957629ab03625b228c7446d6f/mugawodemukekasek.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/49897621817.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/dazafowuwuleren.pdfIn PDF document text
    • https://icbacademy.com/upload/files/82601062845.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9683980ae349ce5f01dc208cba2ebe55/ganililapakutarog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=automatic+irrigation+control+system+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ad11145a2ab2944282beda98f49995fb/48217090069.pdfIn PDF document text
    • 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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 17452 bytes
SHA-256: 3a1961cfe4efe240f11296c6caf5bb5d59807c021833acc03f9af289c9609e0e
font_02_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 11160 bytes
SHA-256: 53f1fbeefe0a2b84f580fa08281095be857e8ac7905c87b3c63b10b1dc4c90a8