Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8d68aaddcf79cf…

MALICIOUS

PDF

91.4 KB Created: 2021-08-17 00:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb7a706ec34987c0927cf77d1534c97d SHA-1: 2dc929b35637910d28b39fcd56afac03240a0d65 SHA-256: fc8d68aaddcf79cf8d0edb7ba235f6f5b1e40823fca0598bbea8d738167a8b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Several heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload directories. These links are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da49e2982---8344688115.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf167655ab---33853860981.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8b556011---51704447676.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d329ad06f8---roxomevuxexise.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2e2eaa42---waguwowoxixaxugasugaba.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/jelomofenuna.pdfIn PDF document text
    • http://odumakus.com/uploads/files/15133058759.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/kumanegikekavojaj.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/suvobanave.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pefodiz.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4b946a14d3ddb016175f476463786829/62001912969.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/gokokorudibalurigopa.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/18891646998.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cace5d209e---duwegojemi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/23224401379.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24a1662e5---zuwogosofobuvamewudezaxos.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d6f0dc0e---sijejado.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/63fda228e75d7b4302d3cf2f6ccd7c05/90372682966.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/76511340536.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de834492116---fisenog.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d559c57e92f---35947541151.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783c8e8434c---pumonikefikav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=el+barril+de+amontillado+resumen+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_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 10884 bytes
SHA-256: 775e3e171329e30466bab8064bfc10fb93d66b2bbd7d61f6b889c87de8e3d52b
font_01_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 18184 bytes
SHA-256: bfe2ba854550eb99c59584f3c160f90a68c5059c37c6d247686674e7a159e3de
font_02_sfnt_off000145b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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