Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfbc75dcbb18869…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 14:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd3f53783a15fbb273618a1d9148afbe SHA-1: d22545416b2d934ed460c749dbeb219ced34ddaf SHA-256: 4cfbc75dcbb18869a88e0406455138373d3323041490bce6b1e2a9121c3dbce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=mi+a3+new+update+date PDF link annotation
    • http://lycee-elm.org/userfiles/file/pemaguzetaxuxujubamejam.pdfIn PDF document text
    • http://chinalabware.net/d/files/64361668412.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/4679786443.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/pebirurojumewana.pdfIn PDF document text
    • http://marymo.ru/uploads/files/17077476248.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/rexitetakoxodufuwagiz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0aa1582da---32901315550.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/misiliwusukepav.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/losigof.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/pewowujazali.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/13195616177.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916a837880---dezubulurebubu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161365343d9e0f---lijif.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/ruzanuzuxanikidinazifo.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/92401771793.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/93414993182.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/gakeloto.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/16571403148.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/rememetupotimazomeniti.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/lubisezamo.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/69181998738.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/10847972463.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312220ad809---lojamurefad.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_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 20736 bytes
SHA-256: baebf04ce7e664ad6b72a6ee087df7c36ac1550739b60a79e10628c89d6b930f
font_01_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 10300 bytes
SHA-256: 2f93e20bb3adee88dd1d68c8d4c81e2c54a7658480d5115a9962550da1925247
font_02_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.