Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b9ab111f01f57c…

MALICIOUS

PDF

87.0 KB Created: 2021-08-08 19:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb8d79b907a36fbcc0d4e830f41dbac0 SHA-1: 5f80c05ecd6532a6d3ab96478ea35bb98fe4c270 SHA-256: e6b9ab111f01f57c4d4b23e7a889deb0ac17522b363867e50f7e6346273f27c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://butterfly-propertymanagement.com/userfiles/file/suzatiturolipajisuwaliwum.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/73b9a966896955fe7c1956f9f5e61533/tizomobivi.pdfIn PDF document text
    • http://chikatere.com/Upload/files/fujotumumevisebinos.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/tufir.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/92075872288.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/99861251874.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/78772694739.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609607d0cbfba---21363250821.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/57516610542.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/81194396233.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5d0192c7673599f223d5e5e14ebff8b7/rulujukam.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f641ca2db---83879240777.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b7kgodovadstd10q1n78ntjvg8/soxokupolerago.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ijo70ibr2mdqdfd82r3kt5fca4/75838027559.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///57809281518.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4128bbf499---13433455249.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3ca20e7b---17460792000.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0035630b4a8d92d3d1c6c444fbb83551/82740528647.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pakekoxilitekaguwow.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/65190989704.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a2bead54---guroregixibozono.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/fapinanoxefolegadudax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=why+is+my+battery+light+flashing+on+my+asus+laptopPDF 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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 17316 bytes
SHA-256: f533b87ec3be16c241de36b5becdd29c8d30a5476e743129247b70076f5cc810
font_02_sfnt_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 11152 bytes
SHA-256: 6782dd3b7f70ce3d20a6d7d9d55e25540793ff2286930b14cc0063bbe3eb28fc