Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d68a93166cdda9…

MALICIOUS

PDF

96.0 KB Created: 2021-08-14 02:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58b866af838590176f80582c42031213 SHA-1: 9eda148329e5c7ff07889f40c9fbb45631b39591 SHA-256: 17d68a93166cdda9e96e8a6060206efc04d7f0d5ff6ea029139bedd0db7c0dff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly identify the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919f4d17bc2---jomaduwokowu.pdf In PDF document text
    • http://rencontres-icare.org/userfiles/file/lutividuwob.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/40276107744.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/zezajemuwapekejas.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201e32a916---zemekegajenerebipuj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb52ec3d5---34895644678.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ceb016c32---49399109817.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160969399c7fad---20280631709.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xepelegilesakidemawenugaz.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/mozibikezekebe.pdfIn PDF document text
    • http://charivne.info/images/file/25797152369.pdfIn PDF document text
    • http://momsystem.ru/public/file/87469179399.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5ebd84b59c4b46656fdbee1c45525340/fajajukogezi.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h5bfe0g87a6kvnfc2aqm3v98ud/49920318108.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48fd33c19---47026888248.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/45209577312.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/28322707356.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9ace9774.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/5124533622.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f68f63d01a---zajinamafobagipimuv.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/moledotilolejuzazitexim.pdfIn PDF document text
    • https://shinaltd.ru/images/file/disatewa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b1f9fdaa---nifizija.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/tedixemedanimaxeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+read+korean+easilyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 17168 bytes
SHA-256: 8e753ce55b0ac374a4abed4a5e35b9731eea4a8a903d29786ecf19b6108c675e
font_01_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 10524 bytes
SHA-256: 3334b7d6767812d470e5e4e61083dc2aa03149f3f85e6136a0f18d4b3ebc901b
font_02_sfnt_off00014e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16691 2540 bytes
SHA-256: ccf6b98fd47dd036029ff01dbf3d1793bcb0eb207e045cb70d2f07900d51111e

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