Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e92bc1ecc66e129…

MALICIOUS

PDF

84.2 KB Created: 2021-10-08 07:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc8b1ce0ba2127b8fda3e5c38862f236 SHA-1: f8fa60d9371ed5a9e62afeb726150bfcd1d19af0 SHA-256: 5e92bc1ecc66e129f165b7da65df30f625c953808d073b94e0a627179babb67a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=how+to+cite+a+quote+in+a+paragraph PDF link annotation
    • http://hankyunget.net/userData/board/file/51738515129.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/66029556570.pdfIn PDF document text
    • https://clubon.top/uploads/files/xazagebunip.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/lusoresilud.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/pisobipiz.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/jevofela.pdfIn PDF document text
    • http://e-sportis.com/images/upload/dasuloxatefalewinogiva.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/85520662513.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26fee44d3---gubenisopoxajev.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/67155642776.pdfIn PDF document text
    • http://castel.lu/userfiles/files/30203985972.pdfIn PDF document text
    • http://hingliltd.com/userfiles/junagi.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/revow.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614085c9e7096---44938537188.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/58308447833.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/48392385472.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c91b00514022f00ab6aba1c11f88ff1b/76482722915.pdfIn PDF document text
    • https://theipbuzz.com/images/file/2406272311.pdfIn PDF document text
    • https://jin-ji.com/upload/files/wuwutetepam.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091123080246489.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/38093643433.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/semonudamokemil.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/mudatajawuxekenoju.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/kedenogelu.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/37190098006.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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 18308 bytes
SHA-256: eec4155f7c25dd20e9d7b1d886ce66db9d6f29cfd8eb9a9b9937b1cc8fb6d073
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 10760 bytes
SHA-256: 2dd28cb576ea9ebb5cb0d57cbe9e16a09d10a4bbd85983ce9244e5a3c15555cd