Malicious PDF — malware analysis report

Static analysis result for SHA-256 f354c9572171e8d5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 01:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1f1cf0d9e44120930f29c588ac9cf6b SHA-1: b6b8bf03d9793a5afffb04a8c57d68f640bea8d8 SHA-256: f354c9572171e8d558393f936948909212fe6badf6499413df433081e1340212
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the document is designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pataibicaj.hu/userfiles/file/20744184511.pdf In PDF document text
    • http://galsabino.it/userfiles/files/wezapepuwitezonud.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/vubune.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/50446345434.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/67608786873.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/wulega.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3c9b7a387706aad6f6e121d1cc2240b6/60837499812.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463bcd2b078---najenusizawi.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/webad.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615213143c414---kidalupupoxisib.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/gulexesir.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/487213319.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/zanuwuzovekel.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/81069672093.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/94580180133.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hlt2841ek1jruh4c1lqd1fplc5/96166035628.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/lavibuvesodofaxaf.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/govakazax.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/81105506278.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/dewumubixu.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/32103823949.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/51913975426.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210914082532.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/tajulabinozuja.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/57128671642.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/jodufukitarixali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=charlie+chocolate+factory+full+moviePDF 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_off0000b2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A1 10640 bytes
SHA-256: fc44f47e6c3fc309e52258c8008f09929fbb01b950a15e7169df65b0ef0a49db
font_01_sfnt_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 15316 bytes
SHA-256: 7bf21b8b5ad2f1e8759755d4e8edae95293794c285fc68f46646e9c5ac4bf663
font_02_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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