Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e84fa4fa48aa950…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 05:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a70ad1bc6d1ab45e3cbc5b4a24331c5a SHA-1: 9cae473ee16897933bda75b8974e2c63f85091a1 SHA-256: 9e84fa4fa48aa950e80e81ad70917166f5a1cf4101c8a256bad9a5fb67c9b869
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the PDF is designed to redirect users to external, potentially malicious, content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/p8imfoi0om4eeeo01uoqbvcgtt/95951417110.pdf In PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/2cf0c6dafe74ffe5fcf29658004da12e/donutafevesuziwosot.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/27119580664.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/ragoja.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/uu13apcvk5idlseq97d26dokc0/10687582790.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c31277456c29dc03c2b552aafb09f210/jafulep.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/livapokad.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/96813904208.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/69479357763.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/f6k9sol9m39d0ijp318hrabcb1/saworinurujexobunajiwanad.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0fb322398ce3fabc6f7033cab6f23002/29200428818.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce3d32cdbd---59966885482.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/54081220916.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/42991876047.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/ximijo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d223dbd8---60537680902.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/popudinowolomugizil.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/makugoxexoxekexofon.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/67765242157.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16102d81404cb2---22676886322.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/74384702338.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3j5gthtlukjens8i6k0dgrogur/22626556308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=healthy+and+unhealthy+food+worksheet+grade+3PDF 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_off0000bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 19252 bytes
SHA-256: 011f1ca337ee997b013bdde5e6d535e2606aeb588a8356c9db431b92fd2eb1dd
font_02_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 11096 bytes
SHA-256: c45e79a3452b8b6c3367e156f4ed8847798257ad8ae6cefc7f0eec5d381da4ad