Malicious PDF — malware analysis report

Static analysis result for SHA-256 450c72f58c16d7ee…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 14:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0cc26df428acb095addd5614e1d08bf SHA-1: 5e47a6ebdd6d99414f9ec2e4f2d794fb8a2ec1ec SHA-256: 450c72f58c16d7eee44341a816eede52b32e994bee6b2e86ab0bb675f8396f15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=olympic+app+for+android PDF link annotation
    • https://diamond-marketing.cz/soubory/92180829395.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/vopewitelogituluzoroz.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/larikijapekanomilimazuvik.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/906927867.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/xebovati.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/48231210524.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/75354308129.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/votikalele.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/60125017457.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/40132503866.pdfIn PDF document text
    • http://tochuchoinghi.org/files/66519580490.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/59184618302.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/67782037461.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613db59a97960---50751041318.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/dizokexelodu.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/75667308054.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/99091c86549d27db8928058bb3c9e856/9727561775.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/22213182017.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/26789741892.pdfIn PDF document text
    • http://youil.org/userData/board/file/waderediteberifonub.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/57663297441.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/ralapewesevajivu.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/68500121914.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c924a60a---lomav.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/karuwogurivaseramomamo.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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 10520 bytes
SHA-256: 73496bb37c8fd3900f7480597daed129a2f874922dba07752a8078edb867852a
font_02_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 18056 bytes
SHA-256: 3e5e9e9e17f413e60701fe41c7f9f217d1165eba3ba51d2d37b11cc0725fc36f

Open this report in the interactive analyzer, or submit your own file for analysis.