Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9657ac22dee6a24…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 18:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74aa17e360143ebc5d63dd26eb623962 SHA-1: 78d0fe899f5b1c7bd4f5463ff6af8d8465f1d976 SHA-256: b9657ac22dee6a249bfe3439a64476df503bd2742a2401d2479689f6536f1cfb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/546f658f2d66c017e8fb10579ed114df/71339004842.pdf In PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/tubajoxerelixetanikit.pdfIn PDF document text
    • https://le27.fr/docs/file/dekipafekumujatewimewiruk.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f74d72e2c---kijumuno.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/fenili.pdfIn PDF document text
    • https://mimpidia.com/contents/files/namulo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c66d8e74275e3468272ee49604d3853d/99755651963.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/78603061487.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/2lf142ndaias8mskh93gjkj53o/72868135820.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/sopavidanexud.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/wurodawip.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d9eb99b7e5f05a0ca5b623bcbe49b2fa/93901091084.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/13881104284.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/dukokivixiv.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mu35o2k2dtnangr2k5q2neid97/xoderepaxivetevasexojomem.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/medaxejapobedusaxa.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/bejokuwazomazofi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134e16de776e---fidutetumoru.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/4240781948.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/42m618m5os45qsvvqfvtf3h8qd/fazuxi.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210715_6E050D8917AE0741.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/48b838c0d5a4a5fb442188628fca5ed0/66510517910.pdfIn PDF document text
    • http://co-mit.com/uploads/files/zukaviwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=algebra+2+workbook+answers+pdfPDF 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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 10904 bytes
SHA-256: 19e45b163d4f91a6aa8b6a35203ef7e6d30a4110d34c255470e19bdf01a2b49f
font_02_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 16984 bytes
SHA-256: eadc9c090e1ab751797afb21927ed831bbc4c8656b6cd6b263b50378404738ca

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