Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dedd41d9bb2c529…

MALICIOUS

PDF

78.0 KB Created: 2021-08-25 06:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4ca38fbdc8119859085c631701ba323 SHA-1: eb1c173d7c18ce439f55eef38610603d9bf3c810 SHA-256: 4dedd41d9bb2c52931eba29eed942cf46036215656035e03b311e3be986cdc0d
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 compromised WordPress upload directories or disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://victoryelectricalsupply.com/ckfinder/userfiles/files/savudad.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce258684c92---doxatokutijudi.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/95503751992.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fobamukorekejajodakipa.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/lasodemipasodovu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/poxus.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe731c30c---86974138079.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/25828465596.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/69716640647.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/fofezabekusopidonefugoz.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/bomipufalakepimikumama.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/9fsffcfigqrv1fkotiqtgblqki/82089888067.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/berojezekimorep.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/vurokobebamo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rr6rt6jf9copq6eom78of4svn1/bukemeve.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210530021307960762981.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa462ab987---27061638748.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/upo91b2n9f38sed4ir487bdj4k/41172411526.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8e323824---dujewabekaxosete.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/jakaxapadev.pdfIn PDF document text
    • http://synhbio.com/upload/files/58148998488.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17565d6c9---jukijit.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/tenugezejawiwalu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6156b2641a7df8eea952929ab3020c7b/82226057711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=homonyms+and+homophones+and+homographsPDF 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_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 16448 bytes
SHA-256: 9ff107b31ded06859a0077a2193fbbe8398ac4871e3a9e23f251abe1cba39ef3
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 10708 bytes
SHA-256: f16ce7bee07ce302e2ab0946c182c75e11bad59b33d8429f679cf0aff5494e67