Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c4ffa817840d7e…

MALICIOUS

PDF

82.4 KB Created: 2021-07-02 13:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb1a4b874127903c521bf661e009534e SHA-1: 38453cf5826d0329dd30a9518882e8467436526a SHA-256: b5c4ffa817840d7e468d4d20b084417937b7584568806c5eede86c68393d5426
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary goal seems to be to direct users to potentially malicious or phishing content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m6fnvdf7mtukd7dui2274u3kcb/84571991318.pdf In PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xiwemifor.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/xudekipumanep.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/76b22284f20b41253728e37a0ea25990/ditabasa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2898c226b9---fojifibujekew.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7a892e71b17ce7fb7b39fe29b0f0e38e/zuwiripafatulopo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fozapuxulemavet.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/dezovim.pdfIn PDF document text
    • http://redactron.com/userfiles/file/vuwerusorebizumofifovubu.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/86625804197.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a651603d1cb---jalemadusudugalunoxir.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/23f91419a3e7a9198e08f861abfd39a6/33161721842.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6099c5ce2f---woredo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c0f05d250---tanusujodetirubepuret.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/17akkts4eria5qlfalh1m59bd8/46008047987.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/wenejipowigeb.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/13b31566000d90d1aaed399e5c1fb100/49831489273.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/5862225911.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/vurelufone.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/55723667410.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84ff96ef4---juladujiduvakoniloguvov.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646e6c0edc---30415251344.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/69f0db219f96afeaeeefdc853221940b/92371084727.pdfIn PDF document text
    • http://bakoca.hu/files/file/velogafafaraguxakok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=budgie+for+sale+gold+coastPDF 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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 16928 bytes
SHA-256: f09152ba75d3487dbb674122c221f857e526923f96005acf6aeca90c68740d87
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 10700 bytes
SHA-256: 9da80256b12af348e5a12d1e7595c6a5e1b6708fd008a0773cd988371c07c5a3

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