Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6ccceac2e04386…

MALICIOUS

PDF

91.8 KB Created: 2021-07-06 10:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0630a3575bf400fd7c33f1cb982cf3c0 SHA-1: 89d3740dd29201ecbcac3870c7257cc243381aad SHA-256: fc6ccceac2e0438671b04e663d492d0af8d4c34e686aa1d471f3a5d7d2884fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics indicate the PDF functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://acgroupenterprise.com/userfiles/file/54442851692.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/779ae1b40e436620d222854612a406ab/dujufalikofodi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812c148c73e---rejifijavemipikuzo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/28/file/20210628_032055_107.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d58cff45---walatara.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210508/file/57420427950.pdfIn PDF document text
    • http://dothi.info/images/files/49349030011.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59011fdfa---jejupefufatatobawaveguru.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/xaniz.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba392b225e---64271986800.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/fupezez.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071741fb3214---24118433866.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/gibinemoxekogunefijev.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608907a090440---88399392392.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dopalitabinibotedobo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd3fd3116---6801887490.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/4412352479.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/makowubipibefegomanumunas.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae0b38e00---51117854986.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160947b1b737c3---piwuva.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/t0a0qksjg3426igmc71t79gil0/27326279120.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/papegesawuxufazuwa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863492a60f2---rizoxav.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/lurepurudefuzuxek.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/43467467723.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18a71bbaa---38672766082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=small+lump+under+skin+on+pubic+areaPDF 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_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 16392 bytes
SHA-256: fc2da5ac5e42fdb47acdb4c99bc30ba0bb062e0278e39c64795db1bd48867cb9
font_01_sfnt_off00013092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A9 10984 bytes
SHA-256: 7db56caca9c46d3404f41088b1b17a4bfa86bbbbcd7e09626e0ff3c14881622e