Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2ca37641b5b82b…

MALICIOUS

PDF

95.3 KB Created: 2021-07-27 18:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8694cae93bf4d9b925f54c8052c9cc49 SHA-1: e5d21465a6210f81ea6f58123be5adfcba106ac4 SHA-256: 8f2ca37641b5b82bf23a59bb36797708bfb9f13bb5da2cfb8a57842ac1cb9a31
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d190023f8f5---bunojawunivabefepakovow.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c0b8c75a---latetakopojajalol.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/go2r01qgge5pov8nj56pngfc6a/vivupotukawebap.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/59202003602.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/sufomasoke.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/47529386927.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/bovolal.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074a1494f697---tuxagisiwatizelevisu.pdfIn PDF document text
    • https://serka.com/serka/upload/files/32290703200.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf3e4c55a---wenotiw.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19242206c---basewadivoso.pdfIn PDF document text
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073307b4765c---74132754941.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/om0ovr5dhc9m3tua3fbuveq1tt/71493879296.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/694f749d7d569bf7a350d93a0e05999c/21554611776.pdfIn PDF document text
    • http://airfa.it/userfiles/file/8503738444.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tesufitajifis.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e04df9b5---7444952232.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb961f1823b---nitotanajunajobogafa.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d11aded97005d328a58c0dc7a4453a8e/27927703651.pdfIn PDF document text
    • https://khanikango.in/file/mavibumijufibupuvifa.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1512671bd---jetuwugig.pdfIn PDF document text
    • https://kede.org/userfiles/file/poledowulufunimoparir.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/soguzepifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+guided+by+voicesPDF 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_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 10604 bytes
SHA-256: 0dcae323dd6b9ab7124501561ddd45d2039b7ad32a12f3adf60b8696fd11ec5b
font_01_sfnt_off00012645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 17952 bytes
SHA-256: f12f96f008d0969ce3642e01a8dac6c2bad27cd4b1857a18bafc0f22fd6c1752
font_02_sfnt_off00015555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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