Malicious PDF — malware analysis report

Static analysis result for SHA-256 907d57b3eecd2654…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 09:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0e90124862f00afd66f0a93ce907332 SHA-1: a5e874fe52690d3b0eb73ac4d38f8b677a1f2601 SHA-256: 907d57b3eecd26545ffe305aa88ea3e240f2320a71a41d9fa858e4b02c11c644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=stream+justice+league+snyder+cut PDF link annotation
    • https://sukhayurveda.in/userfiles/file/36140464513.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/38595968036.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/39016133184.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/41061554468.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/pavavowivomodidisekato.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/50336502304.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/87783078612.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/af0e2ec823d7371da6beffb9959bf653/43341069755.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad9d72fc5---52537852402.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/dujalurefuvij.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/65693613902.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/xomixobanom.pdfIn PDF document text
    • http://shahgrp.com/uploads/73003811226.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/8470477763.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/96748849064.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/worejes.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tj00oupd1k7en2m15edj2na2p1/85607969228.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gomowelekenemirewazobeka.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/volivazetapujevibisiwukif.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/fudiwere.pdfIn PDF document text
    • http://eichler-kammerer.de/telufifonik.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/95974006659.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/54854063050.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/14bd161ddbc4c8cf6448e11459d17fb3/jibawejutufojanazumajigen.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/23111109522.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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 11012 bytes
SHA-256: 394ab644475a940d82022aabf9228583aab0296e3535c1e773c9e48a6ca17491
font_02_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 17960 bytes
SHA-256: b2df3e8988a60dfc973c1e3e08d0f9daff9c835311e23200010b1b7bb5f5dfef

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