Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde6f12863296263…

MALICIOUS

PDF

89.9 KB Created: 2021-09-02 13:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29f8bb5fa276cabb3a7d08cb56c9bc51 SHA-1: f8f2964a1b83d0844fe8bda64f386fe9493e71f5 SHA-256: fde6f12863296263ef56c680cd49959a80540fc2b985b56b6e70b0284a3bfa31
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obscure the ultimate destination or host malicious content. The presence of numerous external URIs and the 'link farm' heuristics strongly suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kahsport.cz/userfiles/file/basalufonudiwotoxopa.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/88mrbstcc61hs0nqn8rfjsbkk0/logegofilida.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/65546311597.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/da4850dc76cf2b61b196b10cc81a91d8/96637692796.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/vikuvesi.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/roweweropamagasuduruxewe.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161091f3d9af2a---46906468027.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/61987327780.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a6674134ceef2c74cdc8c2ddbdc26a7b/mekiveji.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/tojokodisut.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/18226267869.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5db5a8a8---giwinixugexag.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/vuzaguzuroturuxomes.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/fewuwunalamixowalizi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gsqd8ps0mu0d4ljd8849asd4n7/nisolarimem.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f85e8655eed---79995741867.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/98808229207.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dad2e6451---fevoxolumixadajoxejotij.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebca4c0ca---5799768105.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/75768213403.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/30239139927.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15daa0b1c---bonovetobon.pdfIn PDF document text
    • http://clingac.es/d/files/77337127662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=arthur+schnitzler+anatol+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_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 10856 bytes
SHA-256: 9a1631231737bc8fc66ba22eb77ce5816d2648c0ef08e89f9c53c3b66306bffe
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 21564 bytes
SHA-256: 48d2102865d7f25b15d439544f0c19c4bc2cff5494462281792733bf862a8a22

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