Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea08e9f48f52edc1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 23:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d96948230fdbefc2bebedc0221e8a2c7 SHA-1: 986fb73d2725c80fa82a8b71e8b03d27ac42f7a3 SHA-256: ea08e9f48f52edc15d3e5da5630ba32fca8854aaac0b55ad501b6778477b0cd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript stream is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://namratalakhotia.com/userfiles/files/mezivu.pdf In PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/pulewesubelexopuwipegobiv.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/dafafarewekojijegogavi.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/46382331662.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/tuwemibaxe.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ecf20tt0pq53lbgojek0cln945/17273808943.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/73346227170.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/47983371163.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c28d9a9b18---58508538218.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/14222465090.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/ripixisi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5c372606---piwivelukibe.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/82837333197.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/diwikewu.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/51772263619.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/wigixeraxili.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/99507941408.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/vapawutunoxaba.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/sobameb.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/43029773275.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/76523002559.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/bomifidulodalu.pdfIn PDF document text
    • http://kite-surf.sk/files/lenof.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/54773239599.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/movisusabixuzodefobine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=homefront+en+streaming+vfPDF 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_off0000ba8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8A 10568 bytes
SHA-256: 7a63f08b120dc5641df6e9c9e7d4d6fbc6c665968389256ace021e2ad40cfc5e
font_01_sfnt_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 16240 bytes
SHA-256: fb8cdcf56231e149ed8caebaef505d10b976d7bfff6b723b85e6d52de1af6599
font_02_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1