Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8695ad7e7b2bd1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 04:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2d420b31491c980f4010ff53eff169e SHA-1: df6b5b3b324f26ea9d28e441c6b8914c65d2abd1 SHA-256: 1b8695ad7e7b2bd1909ec00a20af451b916a4a7ee752303762bc8a0de9e91d0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb764d55e---funizasukomixozolebizo.pdf In PDF document text
    • https://apskarota.org/userfiles/file/lemedazofofumiwofunonudev.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710c27a946b---17039643410.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/36196078151.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/fizudenofomawadigovaz.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845222f13f---kamobololivalokivonawazaf.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/22943057157.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954c99b3999---mepesebukuxer.pdfIn PDF document text
    • http://e-sheremet.com/img/totifuwepagod.pdfIn PDF document text
    • https://actor-conseil.com/files/file/rapazorizagapuvokig.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/misozifozafo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9edaca26b---jefadaf.pdfIn PDF document text
    • https://protrialse.eu/files/files/govokiwebedifilujadebosa.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13b80409bec2fa1e9278577739f07de5/nekipusivi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7he7s3rfm4k764dbsuqjq0gbr5/vofukobakemojedomowisar.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/j9irenlfabh344p1t4qu6phqp5/juvirifufefulibavar.pdfIn PDF document text
    • http://naucseto.cz/storage/vuxatu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/608bd85b8d49f494608a4ba36961375f/44403638260.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f754caee4---81473939987.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7d0fe247f---zowitidadixazapokekujit.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/jetofibifalonitoj.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dajebo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8cbc8a32---28979723704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=spheno+orbital+meningioma+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_off0000c734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 10992 bytes
SHA-256: 35d4939c718378ae235c7d632f43c0b9965e5c918ec559ad38df9e62e07dc463
font_01_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 17340 bytes
SHA-256: ffb37301b58fa9e27bcb69773a8499d279f21b8667e203cf8f095fda61445981
font_02_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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