Malicious PDF — malware analysis report

Static analysis result for SHA-256 292d0572191de1db…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 19:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 538d7268637e12530e24f68936cdd3e8 SHA-1: 887d00833ea0831f2fac008bd0680851c14fc858 SHA-256: 292d0572191de1dbc204978595a392cbaa757513638e97221c3620da1da0397d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a large number of external URIs. Heuristics indicate a link farm hosted on compromised CMS uploads, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5580af7b---zofitarixujasadem.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/88c7kqt2auoov48gjjetk10c14/budazigababelelisulox.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2f7d34c9---64545975990.pdfIn PDF document text
    • http://orderkai.com/uploads/files/21428253060.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/nufibonixogepujaruz.pdfIn PDF document text
    • http://stattus.com/assets/file/29217709229.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/60729997117.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/66777084033.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/dofixat.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fe16576935393c2e54b428761e70d568/19564530231.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/xakupupuwijugoborot.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/180e214f45b1cd3cd238b4d50105ef22/vedoniji.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8140be6402e8d12de1e1a59a44aa31a6/fewisewopagijon.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/88223326331.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/11417a1b7bc75260961ce06b2c9c7c9c/89518144280.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/805616c8ebbbfcc6c8ebc170b6c2edb6/fuluzitetirotukavovunos.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/60518140676.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/mogozosidilavoredebogoto.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/81593559925.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e6bf8553c---kodof.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/d8ek4t7146hgq29d09bt95k1ng/90414990186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dewalt+720+radial+arm+saw+manualPDF 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_off0000b984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 10768 bytes
SHA-256: 59385774ad37f4fac0e89e85113d07147acf1d385a65c816e63d098b61feae87
font_02_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 16908 bytes
SHA-256: a7b1eb2793b1283668b6a2b74c277c28a0cd40bd9cd2954380dc70959c460f8e