Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6cd814a13111cf…

MALICIOUS

PDF

79.0 KB Created: 2021-08-15 07:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78ff97e350a2bd996460597a768c828d SHA-1: 73aa63bf627bfd18218eab7311f9b1a6454a0728 SHA-256: ee6cd814a13111cf98e49487a5b7616c84304f06be6861b41fbe0cd2d6b74ace
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f9d95883ac7ded17902b1f3f47b2960f/sajumarofurixibegaxis.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/pajazagujave.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/7659868934.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0b6bfee95bc45058fdf69d4a4ee59726/kititijesitikogimotupukit.pdfIn PDF document text
    • https://actor-conseil.com/files/file/telemuz.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/vosowonatazotetug.pdfIn PDF document text
    • http://freeski.hu/freeski/file/sidotovedigaw.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vojimo.pdfIn PDF document text
    • https://artenika.pl/fck/file/33026556275.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2v27mcaf8jlnp2eu8m1r2iqmsn/bagonelivog.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/59610c9ef1fbca8bc44ad7325f1883c2/renide.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/76682949858.pdfIn PDF document text
    • https://kar360.com/resimler/files/megitagi.pdfIn PDF document text
    • http://canoeing.by/pics/files/ragesiveratidutidegiwu.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/6237627642.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/q0bu4762hd3ilqea1tndjo83k0/53918187479.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/30141298706.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/38886539795.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/pm5qd2roo6l3l0mvvfhhe3oqv6/12926501681.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c25b86434db---zuresoj.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//80137027339.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/tobutawe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/33b140cc0a2c5dda4f22fc8aa35ffc33/borurenuvujimuxiderilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+de+componentes+electronicos+ecg+gratis+pdfPDF 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_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 11056 bytes
SHA-256: 57d7c244f053141f189cf8f1dd599c41099f20ed7cb8abc0c4770bf1672b26d5
font_02_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 17956 bytes
SHA-256: 5c875f3d1647bab04aeafffbc1427466239f1a956e59922bf48cb7e504c6dd82