Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1d55da8fcc340e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 05:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca9f348377cba5f0a61a0e83bd83e00d SHA-1: a9196902c8f2bc86a7c851925c519199ef83d213 SHA-256: 4d1d55da8fcc340efd09a93d37cb5675c39755f445c2269c70bbb63b53f9dd20
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://charivne.info/images/file/81354044976.pdf In PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/46772053066.pdfIn PDF document text
    • https://eurotig.ro/file/vexofolojisibafuzejesudub.pdfIn PDF document text
    • http://candientuvibra.com/images/file/13183850476.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc985f88d51---taremedebinisotuxofidig.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a64246604---sixonugibexibibonaf.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/98799785258.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608044c24cad2---30325593444.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/zavulemi.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/21150181449.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/43496929173.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104bf9fe9a4d---62302078005.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/144h1b9fthf9q4ppkaf2552jpg/teworunikibapibujumider.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdb68bb144---86408074129.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a375ad03932---fuzez.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/91a87e4e7a02842e2528f721ee4ee8e4/34763307553.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd026cccbc---22015661506.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oxenixigegavexosaxedan.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2474b4ab8---pafap.pdfIn PDF document text
    • http://emannsltd.com/userfiles/welemanaz.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/xetupire.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/20048543066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=is+watermelon+good+for+pregnant+womenPDF 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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 17808 bytes
SHA-256: 5d1e3d0ae7e8972874fc7ea0a3c07db31cfef227345260104e06dab5fe8cd95e
font_01_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B5 10784 bytes
SHA-256: 6272ed47a93807df54a187ba05271681e65f22f82f81dacedf2a6c01ee38696a

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