Malicious PDF — malware analysis report

Static analysis result for SHA-256 8914c2e16eb7008e…

MALICIOUS

PDF

80.7 KB Created: 2021-07-13 22:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 699167ce2bf34fb5c9bcc96ac19c601d SHA-1: 3cc974e23ea627e4d6164d95fb1f23a60c7e0b40 SHA-256: 8914c2e16eb7008e0e4fabee7d130c2353561a86c34a8b4193b7ec731bdf7675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. The primary purpose appears to be directing users to external, potentially malicious content hosted on these compromised sites, rather than containing an active exploit within the PDF itself. No scripts were extracted, but the structure suggests a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607616cbe04bc---18854615838.pdf In PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/82746616848.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/xuxazonanijabekumosomo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nrd53tun9uqs7ecoqmgmmlf92i/2566589396.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c013732de7f---fazadabemitiwewiworiwov.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89ff3b31b---48241631549.pdfIn PDF document text
    • https://exxontel.com/file/xarutet.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/vewasizepuxidixewu.pdfIn PDF document text
    • http://c-amc.com/upload/files/99795037143.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/19112887315.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098baa295998---xugodu.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/mokilon.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fqrhgck7ffgbhucu06jl1oaukl/jeterowidazefitevemizig.pdfIn PDF document text
    • https://questyme.com/userfiles/file/xosovusepaxiwalur.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab166828b8---mefiv.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/zapalofegukinepema.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/84973917111.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kujafapiti.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1324rnaupmlttm5h801dvq4483/19752985470.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wuxadogiporanonil.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/gegokipik.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/a4bc1f55caae381faa493454038704ca/popidojep.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/1i7ue2gqr1ti9ou2vcl8mpgbf7/wunidupajezugubezu.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kugujuguzesojurib.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f24b4ceee---31790755824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=another+word+for+obtainedPDF 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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 10444 bytes
SHA-256: 119cd3c1fdf3d28286d203d624e9dff34330cbf5a0e3507fd4c9c03b26b0e758
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 18400 bytes
SHA-256: 94c3b94e6805bbcd1361a47bc64fd7996863e84616d29a6d1eebfdc17c612a6a
font_02_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1