Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8efeec6c3d3e6de…

MALICIOUS

PDF

91.9 KB Created: 2021-07-05 07:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc5460809c4057c5be26ac015028ab38 SHA-1: d4fd93a6eb1a8c620421eb5cedff562a647f74c1 SHA-256: d8efeec6c3d3e6def7088ac68a01c61b117fedfd6bf30b313dd23ee1c46a7468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=cursive+writing+words+worksheets+pdf PDF link annotation
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e7573d26---79153509831.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zexonusugejikokurupalitot.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e10b68a0---dazelirisid.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/tomevobefixokesom.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/pifusevedid.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nakaxozun.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gewagixuwov.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5cb5dadbc8705cf2be2d446704d22aa8/luwoja.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/75496587753.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724abe339b4---28993130420.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/volaguvuwutunujofalakez.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/dae84aaadba212d5d9a7e664a07db089/vakavunoge.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16080da7d05fc4---43460471602.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/xekafutikojatanemibim.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c73bf415c8f---49544875720.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2218719a---zimowib.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/595883ba625cac352126492721e40be2/21497200865.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce46d0e3b---wazubigejotasaxule.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/solaxuwukolapewi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160779af1562bd---makalet.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/eab63546a159bb521fa552b31ca8dcef/gugusam.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0d06dcaa68045a8e0c6d8f7624c8d75f/66235531660.pdfIn PDF document text
    • 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_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 17400 bytes
SHA-256: 2f444f96563761fed4ff46caf00257da7d8cf6853a3302ec818ebb2d12ba6425
font_01_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 10944 bytes
SHA-256: 4b18d168ca3ddfda65660b53a0a14454e24ae52f4667fedf8bfc99365194fe86
font_02_sfnt_off00014a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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