Malicious PDF — malware analysis report

Static analysis result for SHA-256 9375602ec0bb8963…

MALICIOUS

PDF

93.2 KB Created: 2021-09-05 01:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d30b86d32b18a796e08167b908eb5c3 SHA-1: 53b370c8b5e1694c138af974f32c2b3875b15330 SHA-256: 9375602ec0bb8963807bf3b5ae157c23b3782ff1fbc9c02b6cb339718cb40fdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://laborke.ru/uplcv?utm_term=amana+dishwasher+owners+manual PDF link annotation
    • https://viettrungson.com/media//Files/vesuj.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/31487535613.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/96179141676.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/voresenenigiv.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5be6bf3d2---jimasowolu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d56083b4708---dafuf.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/99988776421.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/830fb516122edc643ab854b6b0d102e9/zovira.pdfIn PDF document text
    • http://geasit.it/userfiles/files/36211242383.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/wugokatag.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202108261627551992.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/36900224917.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/rokizixuxuxo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9df4c4bee---fazuvopudujo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/70308354336.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/38206411737.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55752effe---suzuwomofubulibogifuja.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gvus6sch8nf2rjp3ckri3kp2l3/25971123487.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/sedigerikutabifofopiziz.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/bipaw.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/13741497101.pdfIn PDF document text
    • https://capecoralliving.com/media/file/wuzejorosunaromilajura.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_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 18300 bytes
SHA-256: f7f633890d17ae4ddfe86569be24c5c48494bdfb4dedaa735eb942576661d518
font_01_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4F 10584 bytes
SHA-256: 486f802a017a8680db937b66921130fa973682e4b38dc7ddf9537844f5d11307

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