Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f8ccf1d9c87ecd…

MALICIOUS

PDF

96.0 KB Created: 2021-07-25 08:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 994b833f4ddfb4391e6cc5f6a85367d0 SHA-1: 5ba9cbd05b9507aeef5d046c5cfe290027faa76e SHA-256: f3f8ccf1d9c87ecd2eeb23037318c8f13af58cff7620c26c5cdca26c95ff8f4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/c8vn3cq2t4bnijfd24ho8fnso5/32970729251.pdf In PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91d187518f---62369387942.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/86662739087.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/30140845593.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160edb7fe24375---babuto.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/81830180763.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fc37cfba95558ed7aab08509dd092e8e/30637406734.pdfIn PDF document text
    • https://beaszemin.com/files/84493516034.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0918f37f---74991252232.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f5c8ac8eef7a61233d8d4449e004f68a/40807758986.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/54f22a1ac47480162be78563441717d8/dadalajovisekupi.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/pexewubazuvokudamomawiku.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/25685802093.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc746c57421---635745647.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/jibogufosodefumun.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2b5471b6---mumet.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/61642268696.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fokapezilojilovunetozo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/94b6f142deb7d035cafe380c55e28b08/39269689322.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/pajugoxe.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d12d62860---13792347888.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/86325345123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=exemplaire+certificat+de+travail+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 16192 bytes
SHA-256: e2ad764752cd4be5999c18614362e0cea8e9c563e7196d76fd0086f860ccaf5d
font_01_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 18996 bytes
SHA-256: 009117d986f603e82445202af19cce4351930d62b30a36d4c95cb9b5b5c0bdf2
font_02_sfnt_off000140de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DE 10540 bytes
SHA-256: fe1cd58f82c683a0049ebe21e282ab85000473e1b060211b5bc92b5ecf6ae661
font_03_sfnt_off000158e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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