Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5f9118ea424afd…

MALICIOUS

PDF

76.3 KB Created: 2021-08-19 00:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fd3d1d7a50365ecfc25f97211cd73ef SHA-1: 976c82feb80ba8eeff50bb8d54705f8a59fc0fa5 SHA-256: 2b5f9118ea424afd9e8add3865679a5536b26110e47662a88ca0f47bc432502d
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7821

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://smidgel.ru/uplcv?utm_term=how+to+pass+dvsa+theory+test PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ofmb3frluqgdomd7166udetm38/68978592811.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/32324423143.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m73db7s9n49g6j71r5jjnkkvml/remurobipewejojelanupim.pdfIn PDF document text
    • http://cosyromania.com/media/file/pelopesegerowujufijopo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160714653f0cc1---kuragizezitujo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fb8168e8f---45653974430.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c4b5e760---92896445402.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ecf9ftm5meq06jjjgtd6jgqlnc/nixazezijiju.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/49266372949.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/27908777163.pdfIn PDF document text
    • https://cakkue.com/contents//files/47810321524.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea3ee2e536---99007287719.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8e9541027---4640243398.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/rikotijuseruxafawe.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/ketijusadopuwomi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e355816ab1---40213697669.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab001b58c28---liwuli.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/njrs6vup65pdtrh7cd9mnnk4fj/4785118484.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8dcbed0d1b54635b2e2341ccfe36b43e/gunubozutaboxuja.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/71218266354.pdfIn 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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 17164 bytes
SHA-256: be508d3b9798ac2ba6a61293f69f5c2fd8611d20b378cab751bf2277a6d931ca
font_01_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 10504 bytes
SHA-256: e7e762e72249c7407e182e301dc8bc3f6376a8ffbc06434ff64dce5b8b05ed0d
font_02_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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