Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fdb1d0e54ee4ec…

MALICIOUS

PDF

90.7 KB Created: 2021-08-12 22:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f26c366fc00747aa23f7ed53c0a67e68 SHA-1: e8c8ec1b793d4c55a799bd3e805b10541b76e91a SHA-256: d5fdb1d0e54ee4ec4fd1ecf16a6ac28e2f44733232f9699902787842e377883d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to multiple URLs hosted on potentially compromised websites, suggesting an attempt to distribute phishing content or malware. The presence of embedded JS and the link farm structure strongly suggest an attack pattern involving user redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/75230094728.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99c7e411a---woforax.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/98900889156.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/64690364153.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/95921789880.pdfIn PDF document text
    • http://art-ball.net/files/file/tiwilixoxinuzefuroduwaxog.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/vodumododex.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/55290872891.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/raputoroxotoledi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/17fe87fa5ddcdef8a16c0afe46e0529b/84226238806.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b083f2db6f68e2ddb6a5d9b36813bd57/605070432.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/rafaroterulitowagizozom.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/46237930614.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/negasutipexusa.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/faruw.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/pazotakomez.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076257219721---wegojap.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/50762413721.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/xaposej.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/2588181524.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/99927449125.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9e5a62ea---74969755603.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a109e7526ab---nidikelofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+4+main+branches+of+philosophyPDF 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_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 17184 bytes
SHA-256: 0e60d8e5f2f9a1dfd3f75411fb9ac32284eecda615a973a711917f2858fafd9b
font_02_sfnt_off000143db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DB 11072 bytes
SHA-256: cb7bf58b02c47152dcab9c85faff08271ec81134db3e8fcc99e2f674ee0f818c

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