Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7ffa3b4037c797…

MALICIOUS

PDF

80.4 KB Created: 2021-07-14 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06c0e7efd0e59867dd5bdb59988596ed SHA-1: cab57a7fc8e6c406900438099f140607001c2cd6 SHA-256: ce7ffa3b4037c797b9d42fef43f4583e7accb120533c0df6f7a08260952fc0ec
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://giasuthanhdat.vn/Images_upload/files/rurefegevi.pdf In PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ed78d255ae4fd2adcbd8e6f0ee4008c7/20552665749.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160759f809aed1---bizukawelunoni.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/wilewebakunimom.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f405ccb10b---moxazujekaxutozi.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/54783723723.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/53bb121ea40c512b2ff6bfcac778d9da/77235417335.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/25326330364.pdfIn PDF document text
    • https://educhina.mn/editor/files/bolifudinivowabonage.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/43544070470.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f72a81548---80264666974.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bcec5253f---74420694163.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/52788246397.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6593906ed1---nerigisi.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/xisofeg.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fexufipagibapoxevugovolaf.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d37ec4d1e---tename.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/10055139808.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/24182309603.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f6266e71---85777842503.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/79239654394.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4e0a5e70b15b7532fd04b5e5e1334e3b/19161932291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rice+and+oxtailPDF 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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 16872 bytes
SHA-256: ef224183766051da1539d501bb22c241abddaa1dae238e9b0fcf9c38bb7fbf62
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 10240 bytes
SHA-256: 044b917a226475726dd882ce3f4e49d0153029c5b907bee02e574d6dcc7a7283
font_02_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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