Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ded8aac09b8830e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 21:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7610ef934f6f1c68b3942b7fb1603ac5 SHA-1: c6d915bbc7b41cc78311dc868070fad7d45744cd SHA-256: 8ded8aac09b8830e35f399482143834b3e4aebd7e932578ebf44569b80c8ce3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/54f4b2618mbca9475ffo2n1mqm/xepuwexet.pdf In PDF document text
    • http://hoigolfbinhthuan.com/users/files/57375430100.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/54758302204.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/rewejinit.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/96907906548.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/datalivekujaledigibilaxix.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/kedawo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b4cb77fd---55518559012.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vakanuxoviragu.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/32932018810.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nagevoxanorel.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/17211073857.pdfIn PDF document text
    • http://greenbrier101.com/userimages/xudirezatolefo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134677747de9---fetapasetozu.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/77818450446.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/86823092540.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1554656612613325f3d2349.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135df6e002ac---84146293366.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/45857741882.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/86957727657.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/zamevima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mary+jo+putney+k%C3%B6nyvek+pdfPDF 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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 18980 bytes
SHA-256: 5dd637a611bae2342004e6fcdd0207bd1fccb3637040e737ec8d770aec6454e6
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 10896 bytes
SHA-256: 05bbdd19e67b6031e9f061e4e608d3d5a8d9fd81ec9ccbb77a3455d6159c6191
font_02_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1