Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f160d194bf26a4c…

MALICIOUS

PDF

103.9 KB Created: 2021-06-21 10:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 637c166528a7073547dfba8b97275c61 SHA-1: f325f517f66153a8c7f4076344df6bd3f69eb1be SHA-256: 5f160d194bf26a4cf145ddc6ae3e87c119745f1eef22b0325f6ad5414aadead7
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure for users searching for song downloads. The embedded links suggest an attempt to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8615

Heuristics 5

  • 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
  • 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.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee53b94d44---82073549286.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8caa3719---daxegasuniviz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6eaae5be8---tofebokud.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/708a166df3b83017848ebb21526dd2ce/semeravutuzames.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/807713adb72e07189e8dea02ebfec636/66186762224.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b88ba853764bae6453eb0c94f68d9cc0/68348800398.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/damofupeneleseto.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ed722be5---15476134922.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/baa65884ef5a8cd373b4dff34c46217d/pukowiduzimufegegelebul.pdfIn PDF document text
    • https://agatanorek.com/files/file/65633515866.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/54762519651.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9887ddbf---fezaba.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/20216171081.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/2054651511.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=teri+yaadein+mulakatein+atif+aslam+mp3+song+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14633 7884 bytes
SHA-256: 666601a4009c469a667168ffd452b80be28147564a9b81ab94c71acc3a241ac1
font_01_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 5732 bytes
SHA-256: 1e67c50008cd3c61f4d0a0d322937c5b0fa7ad8e1b42145cee3a4eca240f518d
font_02_sfnt_off0001747a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747A 16248 bytes
SHA-256: ea7d7395d9c4447fe9eb1313bc2dfc8a06855e887d574a02d6c5aa072d2fa87d

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