Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fe6ce8e0e73d8d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 02:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b485dfc51e080456d11068d9d2966d20 SHA-1: 7d398b7754b0f111521a67e23c527ff68e327962 SHA-256: 75fe6ce8e0e73d8dd8eba4d47135105c4205cbc67325356a8c19174545f0b45d
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to multiple compromised websites, likely intended to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the use of a link farm on disposable hosting. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

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://ringid.vn/ckfinder/userfiles/files/wanodoxufu.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ed908da0697---228315957.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97722315438.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/2283643683.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/maputikawix.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/denukedebamajujunapu.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/kufavajapajenapokosuzifo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/wazujebu.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/72091627704.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/mogusivitalixumivafab.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fe11da05678cbee1c7b6b463a63848b9/kojewinuwibulomuborolivu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/79420826678.pdfIn PDF document text
    • http://ipublicity.cz/data/file/lezorovijubuluwo.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/53830651131.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe3bd14db---21131741435.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/retipe.pdfIn PDF document text
    • http://bamila.vn/luutru/files/bexuw.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/16895259770.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/gomifowoxuzanisoninaxud.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/wepevexogiganesibawijo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607985557af88---lagejax.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/57120654825.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/vupebo.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/kixodati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=comparative+superlative+exercises+pdf+perfect+englishPDF 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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 11368 bytes
SHA-256: a88d285ac74935a1f43f3b0cc49dd48e9450bb7f645f8471a24214b262eada15
font_01_sfnt_off0000cf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 16124 bytes
SHA-256: 8db24ce1644552beb27c735c895de9afae366b0102affec329cc6558068b3c57

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