Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c9450f7add960e…

MALICIOUS

PDF

93.0 KB Created: 2021-09-22 13:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 892d59b2e4dc2b0b3b6b26d1e61f16ee SHA-1: 1a5d97fb8750e0feadf098e8b83d49c2f801a890 SHA-256: 55c9450f7add960eca952716df32c900c1f9f37e19c72ec1d3c7c7806c3b2cd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=minecraft+mods+android+1.16 PDF link annotation
    • http://8njl.com/userfiles/files/82294960126.pdfIn PDF document text
    • http://domexpo.ru/up/file/gibuxunu.pdfIn PDF document text
    • http://topp.pl/_topp/file/95849691133.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/39789503559.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/podezatitidufizepagapabe.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/60909050516.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/76009216286.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/45109500688.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ef133c8535e212a9c0e8f721f7b9d2ca/zerasiwevarabas.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/81271161bcddd390957f7dcb11906665/totufogagilizin.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/89897992734.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/xibejiwamogikopogalabi.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/nolegituwut.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/jeviw.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/85235391512.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/wobaxekajilozuzonaguwupi.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/lokutesivagoman.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99bddc2ec---53259669496.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/2331184604.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/92030972104.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/84152023282.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006f224ef2---durad.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/pakofulin.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/sesebena.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/ginowotoxipewusasiparawu.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_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10872 bytes
SHA-256: 91a0c53078379b539dc4dbc144f72dfc2f9cc4f075ec0c0d05ab0631cd02689b
font_01_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 17624 bytes
SHA-256: 0d139d7bc64cfc7e9824d14435bc1e26dcb5fa4c7ead9031594984d24399bb8f
font_02_sfnt_off00014e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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