Malicious PDF — malware analysis report

Static analysis result for SHA-256 2753dca0275ba68e…

MALICIOUS

PDF

89.5 KB Created: 2021-07-01 17:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fc53f096f5b5565a30472cdf5b663b78 SHA-1: c7906f298c70feeca5a8b93d0f158e250d8e2f8f SHA-256: 2753dca0275ba68e37c0f2c34ebf6a11fd07b44e8c2d6206c25ee5b31c73417b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://omni-links-europe.com/xolaju.pdf In PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608695bddfd43---dimavug.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7cbea547d5ee29dd98d054dada5b6ea8/98095180568.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebaf66ddf---fapex.pdfIn PDF document text
    • http://atek-ent.com/upload/file/mesaripewojodinogoruna.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/lusaxorit.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/mupijupekuzexewekexo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fce6e4af---berajaginalelama.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b99b3576e3d8f2a50cb34c05b400a75c/33560722625.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ae39974757b6fddc178a816360460149/53574713083.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cbcf79e2c---fowij.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/80523930873.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0559766ef76d715b43935e5ed6cd0a22/94736743936.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fdd9a836---92106399587.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ft6r65qihdj3hans6pd1rb68if/verosiwisujujanonenupum.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/luejrkcqlopp5s4k43hvfb32g2/norolarulipopalevupitev.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/wagajuvi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/031a38dd5a1267296b4def84fb826b1e/pozigivadiligifexoji.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rroejlo0t8m0d4lp3mgtbh2mt7/jenidejetirosol.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c06d9900---73717053094.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/makinon.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/17f444e46a151010f571dacade273fbe/takedikimesisivodi.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/tusofaxatut.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/xikiwerilas.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/tazegewolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=good+witch+tale+of+two+hearts+watch+onlinePDF 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_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 18636 bytes
SHA-256: 872a95b5282075d0fdc7d25029bf766555a73c50d71fecf99ae7b5c98a82ba35
font_01_sfnt_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 10696 bytes
SHA-256: 345f2e10ce92871fe7d002c4f779bd002bfa85dfebdad554a2d5a73e0978f5ff
font_02_sfnt_off00013e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1