Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d5f19a053a5671…

MALICIOUS

PDF

93.4 KB Created: 2021-09-06 07:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f8b07c01d3fc3e413ef156483aa4e29 SHA-1: 12b67072cf73d4f9130dbd25534888653e0c9673 SHA-256: 33d5f19a053a5671b53be4a816135de80171c8ee8b7ee8a256e658c50ecbacca
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 https://casentinoshopping.it/file/lujidedupesijixedafaji.pdf In PDF document text
    • http://albarossa.jp/js/upload/files/losira.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/suxoluzakeduke.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9cb088df9492ac11b503c44c0719c74a/39030836088.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a472c80c1e9---pawosider.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/jazelenudadopej.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/migojetozezefam.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/28653957782.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/27974591609.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/buzikokub.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/04a02f683a13d4ac270632412238fecb/44600877198.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/96958027995.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/gadawepomazo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236aee9f057---kopogurajapopawodofogopo.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/vovudefoluxodud.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2ab53c2d---20868507640.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/38651560452.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/85htei8alt9dpqftm9otq1f44e/37960862162.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/gawatokidobaxixetoxoju.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/fesitipaniw.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210829_70DB778E5E847392.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ada8d3e5a03f97cb5961f3a9127a1a27/47069761164.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210820172848_tuaz12.pdfIn PDF document text
    • https://limmaginebistrot.com/file/32330788399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=robot+arm+kinematics+dynamics+and+control+pdfPDF 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_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 11172 bytes
SHA-256: 65d26fd6f72f5ed46aa4bfe71e7aac7a044be3ecf3bf88fefd1117b658567f5c
font_01_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13524 19228 bytes
SHA-256: 96d3648ca8f504ee2ea8d3ff7dfbfb59e234832df8c715c6878bbaf592a51c9c

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