Malicious PDF — malware analysis report

Static analysis result for SHA-256 12718f5ad50dea04…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 13:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3309ca86745706572ea661146c7f5d3c SHA-1: 408e1824b473f9ddda611422da258f492a6fc78f SHA-256: 12718f5ad50dea04899336ee50b2931f3597c8d9441b638be63e7a79599e19d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file is a PDF containing a link farm that points to compromised WordPress upload storage, indicating an attempt to host malicious content. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', support this assessment. The ML classifier also flagged the PDF as malicious with high confidence. The presence of multiple unknown URLs suggests a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://toshiteriyakiburien.com/uploads/files/30079538370.pdf In PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/11240820198.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/zujajodilakelijuxula.pdfIn PDF document text
    • https://media-get.com/userfiles/files/sudamako.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/rafexo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b17d883c5f---94847742620.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a8ad6ccd76348d43ce796300605d8cfc/logotixiv.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/sugivotimovonurakipaz.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/pupogugasokeximitona.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gomugutunifurawuveka.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lr7hacmj0ss5uji1fk15afh1pl/58709912914.pdfIn PDF document text
    • https://harom.ro/files/file/55003189264.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/rewedemigamaxat.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/62231193865.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210911212205.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/filegurevelogigulugod.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/264616891.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/1540694040.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161411f2d1726c---tifikeliwutedego.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/veloviberatu.pdfIn PDF document text
    • https://hoongnau.com/upload/files/35405470315.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/39448538935.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/sasexibesibazitufax.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/47255434736.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/gapobikogu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146be358be45---84347507012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=choda+r+golpoPDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 10108 bytes
SHA-256: 27c068f31be3a40571114bd527ce68b17f23e46295b413d659822e38931dca31
font_01_sfnt_off0000cc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC81 16332 bytes
SHA-256: fe915e0a565f60311c162fc715a2f09add4b9777a056f0527cde4a594b181d3c
font_02_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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