Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fba36514d369fc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 05:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8df4388a85e6baab2cdf5dbc471e7057 SHA-1: 77216369d8eb2a61bcdefd426e41e31de53acb4a SHA-256: e2fba36514d369fc3b80345f62d08dc8242213e63f90fbb603b8df2afeab35c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nomylo.ru/uplcv?utm_term=ashley+tisdale+and+debby+ryan PDF link annotation
    • http://rudolphi.nu/userfiles/file/pezonilupomewekax.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/60613282158.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/32121812914.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/sijavov.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/baguzezadaro.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612d118f0406c---71454456345.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/vevemivix.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516073724.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/ninesanevuwobovujexeli.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/vadinajurilul.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12840399143.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/1267772751.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/71726908496.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/73222814687.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4eec8391261074b1875b6d1e98deb943/donewenitu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/cc72f8e9f8e6c52abc83e8162e9b7cc3/pujezig.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/roditolujaxub.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9bdac8f7---sibime.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/vebinagivip.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/41936366003.pdfIn PDF document text
    • http://faradbox.pl/files/file/sosamotepirexefasaro.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_off0000c75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 18976 bytes
SHA-256: d101425f3303f46c661829bd646438fd514c15b05931d2900c6ae07118e2754c
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 10460 bytes
SHA-256: f2d015f0f888ace982fad826d917f357d687c33f62bf63e9afe60d3144cd075f