Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b1259d6fd03f56…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 23:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a89297620f95434c42c988c0d56f3f08 SHA-1: e169fbb84da340e6de3325515dd942e735bbde20 SHA-256: 32b1259d6fd03f56387f3adf454c339c7eaa44947b2143b10212a7ef04dd9124
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised websites or disposable hosting. These links appear to be part of a link farm designed to lure users into downloading files, as indicated by the 'utm_term' parameter in one of the URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=granny+chapter+2+free+download+for+android PDF link annotation
    • https://nabil-doukali.com/userfiles/file/dorobevevidodet.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ef60ef8273a06984ece7b91d370e0d6b/62142603499.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/43054331779.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138077e8d327---wukola.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/16476916502.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109181035178004.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/65344837870.pdfIn PDF document text
    • http://spharma.ua/files/file/gajovugomijedomaki.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/gefitakawonurugoje.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/vuwomeselobifusixu.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/9074072485.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/74713794268.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/6547036932.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143d993ab91a---jesifewiju.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/xamevamapuzudogev.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/bibomemetewubewirizoxi.pdfIn PDF document text
    • http://vitrine-prof.com/files/18314535374.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/52743454554.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/77547968680.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/gugewonuwa.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/lerunuzujubozosifututom.pdfIn PDF document text
    • http://djapm.com/userfiles/file/64799589580.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/74024677581.pdfIn PDF document text
    • 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_off0000d300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 17500 bytes
SHA-256: fcdd82bc09eab138e835e4890d278934ea15fa787cc9ae8ec882505271ae2ad6
font_02_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 10908 bytes
SHA-256: 360ae1ce59349a405b3d833dbddc5bd1beca940768b8fc54bb98dd778ab30586

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