Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea95f67db079698…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 20:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75fd3a9cd5597eb94649c931de98b2ae SHA-1: f500347ee31f9ad7a70c320f5e1176c35e4c7221 SHA-256: 0ea95f67db079698961bbf83f4bdba97b810ea1314440344dbb61e3f3f6cebe5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary purpose appears to be redirecting users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb28b0af63---xolavulodogemibanisitizo.pdf In PDF document text
    • http://shipagents.nl/uploadfiles/file/51673172043.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bb6a91e968242acc75e1c9882d2d8cd8/kulabegawunetedevuxid.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/14592983122.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/bosefak.pdfIn PDF document text
    • https://bor-diing.com/upload/files/72899156493.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sdll90uik1d4o1sgms7faftqqm/53051809687.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/63162149195.pdfIn PDF document text
    • http://poorclarescork.ie/images/11095510917.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/39cfc8438a12a2a5dbab346ac90525c7/modovatu.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/jabazimufoxudidutotelula.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f91gng05tcfsfovhf5e9pu22k7/wavoze.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/xalanosoxakogedufilinigid.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/jotiwupumo.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/bazuninam.pdfIn PDF document text
    • https://webhosting4.net/media/file/90875190737.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217ee937181---pozileranemorodaruve.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160716b48305c0---tonupiwow.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd0830b59---47416619467.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/nodarejewijepixag.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/vajeno.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37c95afa2---musagap.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/68582052908.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/3254575662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=quadratic+equations+gcse+questions+worksheetsPDF 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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 11084 bytes
SHA-256: 947323634a5562a2969344c7c1d0afe0762a81c6eb4279c3ede15cdc78acd050
font_02_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 18652 bytes
SHA-256: a1046c7c1da60321608ec20a48945d5faba889e466bbcf832b09472e2f002115

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