Malicious PDF — malware analysis report

Static analysis result for SHA-256 f375dc3957e46756…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 05:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efd72b1385740be081f358b856ef3c94 SHA-1: 5700b5bf89ba633c444c38f9b0106175f2add735 SHA-256: f375dc3957e467567b0bdac6e4bbf50648cc5ad411359f59aa9ce3512054ed70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and link farms indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=android+wlan+zertifikat+ausw%C3%A4hlen PDF link annotation
    • http://color-gateway.com/userfiles/file/77863315177.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vatov.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/rizisubepevedejonakesedur.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/sajusamoxoxipoxu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/22303812927.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/87803387594.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/jusal.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/6321177089.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/49919498904.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613c637e706c6---biguwezulevolagipugunamum.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41455234531.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613565735c1f1---77832192775.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630922572emK3.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/67900233374.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326f375cb8f---33306197305.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/54621367793.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/10717665792.pdfIn PDF document text
    • http://boldogelet.hu/media/poweve.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/95684950643.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/zonisonanamas.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/kewuv.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7bbef900d0f6089c819616d14c5acc88/buzenopekumolejuzu.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/bufofoko.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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 19612 bytes
SHA-256: cbb91430f7c66bb0c9aab455c6d756f87eed6eaa28647f0c115f8bde6a6434ca
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 11028 bytes
SHA-256: 6461e9f04432521eba57886d0d1826b108b1633efecc830eba344fba797031b2
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1