Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebed8b5ca8d86d12…

MALICIOUS

PDF

73.9 KB Created: 2021-08-28 11:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f163924e2f82e4ae5ce8589bd912699 SHA-1: 60dd55b1fda69df36fb38b26c106f036acddeea9 SHA-256: ebed8b5ca8d86d12e9e5e0c10be1eefe11d6f0184ec568bbf42881e02898b822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm nature is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=antigens+can+be PDF link annotation
    • http://reanda.com/jingkelun/userfiles/files/20210604030536.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e95ac86700---puzagetefaf.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627034033_2af5b25ae2.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/45127929822.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0560d681---55809825208.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/rujerurokadaxogokozokem.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608429ba1ccca---51490539034.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/02ee2e8c76036e72303120846013b3c9/nikupujununumebozok.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c27ca2fa---38879949185.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/537d8f04f0bd0c05115009e880765429/44079566194.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/900a9270266feca4bc78c1e860201495/lifuwamuxu.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/gemetosotifamij.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/18629364627.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607287346dfa4---15338788457.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9488c8c7e0---44616367320.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c79dd9a4238---18438058505.pdfIn PDF document text
    • http://termocity.by/pics/files/muwakavuxiw.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/ramevamanipewupazus.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/80108544170.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4b34c8ea6281119de6a89eb8df3aadc1/jarib.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jupepepapogifoten.pdfIn PDF document text
    • https://jobtiara.com/files/files/jinexewuvojefize.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/geditupatafej.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/zufebelufas.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/sunarozeruviwemuxu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089f9cc88d9f---43158660631.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_off0000c2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 15816 bytes
SHA-256: 2af731ce586915d06f358c504c062081b210fc77b7d2ff59688eac4018b1104c
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 10260 bytes
SHA-256: 38822e0ef9469bdf11993cae389c069f4e68f15f92d56859bd3f99e47ba62e6b
font_02_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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