Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4fa079c9df55bf…

MALICIOUS

PDF

92.2 KB Created: 2021-07-29 18:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18d2ced07e28fdd8029a4abec806fea4 SHA-1: 4483f7ad2f141fd4167000e4eaafab135009daec SHA-256: fc4fa079c9df55bf4cebdbfad8ac94d8a561c5d9774a9bbf7829b49e933b3069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to phishing or malware distribution sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=crimson+tide+full+movie+free+download PDF link annotation
    • http://sinproval.it/userfiles/files/21944845968.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/76955750703.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/31323144804.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/kuditepomu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c478bf24265668f52fa2d8be71663c3d/48410238830.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/wawinigumofozonajavifek.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2b272e96b---57371872797.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/19718703885.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dd6sp4hpbamt3lu64mh6nft8qc/mibulilaged.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/bebuginobu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tuzuteleleve.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/jibelunenagofevo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uqtr8f14h1a8vuba7on2nbi7i2/46139718595.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/gisomidakizepufuwukid.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/87da25e184896e0a702bd2e0c070caa4/rutivaso.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/635462bff6a742e8e73e56a398945b08/subomifonozenepuje.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/lepunenona.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/70232665199.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/56549405403.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a290ddefbc---loxilu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/da11d7632eb0a2d506fe1465ed6291b0/97402303325.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_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10800 bytes
SHA-256: 5db6801c1039e911e4f8c9f272c4ed5911f213a8b3eaa5bb193de5d5e5bb576d
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E5 17548 bytes
SHA-256: 2daf7e29aabaf6ba9586f6a637fa80efd3255917149bb613348a6d2884c1eac4

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