Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7cd8ce3aea8779…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 09:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f043566bdd9afa2e0ea6f704e355101 SHA-1: b930be514b3180f9231e688888b9786c378faa91 SHA-256: 0d7cd8ce3aea87791aca0d92fcb807a1570e0fce046f93e98874e5081c96bc97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, suggesting a link farm designed to distribute further malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', and the ML classifier also flagged it as malicious. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b329baea---30852714331.pdf In PDF document text
    • http://seattledesis.com/fckeditor/file/dakuga.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/63077083361.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/kadesalodanamupulinurigix.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lobisopefaveji.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///tenoz.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/62541097505.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gajcf5ght0uskgn93vahil4k99/xusivu.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/fatopesa.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/gonafosinufabaxududatud.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/9584018068.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/mimupurixivuwol.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/34888895109.pdfIn PDF document text
    • http://www.bash.cl/media/file/kezuruz.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wisubu.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/sonagifevumo.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/webuwulugirowarujun.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/xidofevemamiketave.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a27941995d56834f73316cce1ab6ef8b/2681397358.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373e07128c9---legiwa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/12018548593.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nirudiwif.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614086141323d---41774521860.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/12886789845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=five+nights+at+freddy%27s+1+mod+apk+unlimited+powerPDF 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_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 11464 bytes
SHA-256: 764422c91eb3484884b1bb2b09c4ba12bec65571031a20495620da643349db5c
font_02_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 17576 bytes
SHA-256: f18f03bc867b59e0a964783075497a8135180c07a6295da8976c23303d6a48f4