Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bbbff40fff2e57…

MALICIOUS

PDF

117.3 KB Created: 2021-08-04 02:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cd2bed7ec6bcd300967ddaa067f9e792 SHA-1: b16051134ee774f667a45c0465b4edc9c4bd7286 SHA-256: 99bbbff40fff2e57742083d14223977c596c6b6d61eb0a430386e580105d6634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to serve further malicious content. No scripts were extracted, but the PDF structure and heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dakotaterritorydevelopment.com/ckfinder/userfiles/files/kidaniroruxijomeg.pdf In PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/wurofiliwelojopezovozelu.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/gemejege.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/75821383263.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/funojik.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/62196164239.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6461e09056b7f6f6a8af5bc22c6f41e3/58456583299.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/43bf38b9f608606a5a4ee2748e84001c/luzupolumarapimekanugujo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d75ff465df3da673dceb5a1be6826270/diliw.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27315457a---fufiwemokafizevekaxetu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/gaferuwelexu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2937a28b9---44499342679.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca05b6151---famusixi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bb83a3359e208199ddf21fd041e855ba/xeduwiw.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/75b79012fa5a506f1759e75ef2d6f780/newusesodegofila.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/17522035830.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f41651dc8fe9cc2e6a461e1798af66b5/67461444583.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/fewumufekegu.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/5697908291.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/28040613944.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210802_6739F20D874F227F.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d04e3e0c---soragudut.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/59380619819.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/47358823870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=paradox+gaming+fivem+black+market+locationsPDF 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_off00015c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C94 11220 bytes
SHA-256: 0e4c07b02e64b59d80cf440a8f10c3226d4ccff1d12f93fef2313caabc57780a
font_01_sfnt_off000176b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC8 21920 bytes
SHA-256: 314a67e04a879420f79bbcd216a7d1f0d4ae826c4a6e0d10bdf6757e4d83ee05