Malicious PDF — malware analysis report

Static analysis result for SHA-256 175c7def5352b031…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 13:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a972827a9f61fa79d3ed43dc7b0c33da SHA-1: 87dc49bf93933dd49f150e718ad1d2d6c0b1192f SHA-256: 175c7def5352b031453a65fef0ffd72caf54c38e1d7410e7b3c6461e5a6c3bea
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious sites. No scripts were extracted, but the presence of external URI links and the overall structure point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=snapdragon+easy+root+apk PDF link annotation
    • https://braintreeclinics.com/app/webroot/img/files/zisinatinudemibuduxo.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/99666287209.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/21970022251.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7350ea8e---24843308431.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/74959255211.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1af69ddbac248a454413313e8c1ddd4a/35677607008.pdfIn PDF document text
    • https://terracell.info/images/file/jezixegulofenunivovo.pdfIn PDF document text
    • https://expomediainc.com/upload/file/bisuro.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/25536779472.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/xanawemujisi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd7b0f83e---81067473420.pdfIn PDF document text
    • http://newcityhk.com/userfiles/nukuzolik.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109051421006291.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/79243733832.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/wogajalulagobe.pdfIn PDF document text
    • https://mahae.hu/files/files/mipijaloxud.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/zejiwaxofiwaketo.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/79909161527.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/17436573802.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/nutetu.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/xuduga.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/57603152182.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/negazujiluguvewanikixaz.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_off0000b744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB744 10708 bytes
SHA-256: 4e95c401d30659aab4e5f5a4f36dff3af9bc88b08c7fed045e02f8867053d535
font_01_sfnt_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 17552 bytes
SHA-256: 4ea0aa9e4092c2f5ae4afe528aaa2dde3d7eb4b08c678081befc9387f3dcd07d
font_02_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1