Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94bdbdb0a659bdf…

MALICIOUS

PDF

87.2 KB Created: 2021-08-20 01:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 836411be9f5acb6bc32dc721d91a5c8c SHA-1: da4811f1f737e30e606ce641312fc0ecac8250f2 SHA-256: b94bdbdb0a659bdf0689c91ae911dccc428f03fd6fef550d54b181d681d2cd2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ed0ee3f15e---20506885978.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/367d906d79fa830ad0aedae6302ff5b0/difaxixupetatemu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba048b8376d---19117942841.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/17987136483.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b044cd61---nezinuzopi.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/kibinuxizilutukemokadag.pdfIn PDF document text
    • http://asfalon.com/__files/file/sotejojiredasunokudozo.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/navobija.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40d17c504---pupokeduboba.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ac58bf05c71d0287e95ce0839cb859d8/mozezid.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/lubimanatodobetabefizadi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/03c10e3cf5942cf387ecae0a00ba5213/99445376524.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aaff8ce4806---97371534075.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/20884583817.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210519114807254.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xifubagirabizaxil.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/zutexare.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/8046078578.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccc537fc0---zarikikirutobavetoduro.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ad96a6775---dovisewibufabusuferovu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/64db2e7502853fdf8c75b7f8967d6010/netupuvam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=can%27t+download+cricut+design+space+on+macPDF 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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 11108 bytes
SHA-256: cdb0525dd932f7a22d066ec2a91ce854a9af1d1fac64fc87c81f70f3b0ffd96e
font_01_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 17876 bytes
SHA-256: ce9b727b250d11ea6a16cda0fa0bbc34c3ca6d5e2863bf3f56a16acbafdb59e7
font_02_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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