Malicious PDF — malware analysis report

Static analysis result for SHA-256 1692b334eb8a4d60…

MALICIOUS

PDF

101.9 KB Created: 2021-08-23 11:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 73b78663cb90bade5aac8c339ddb4624 SHA-1: c4eac1d9183edabbc431542f07c1b4e6eb69e7d5 SHA-256: 1692b334eb8a4d60a9bea2e077f22cca1ebb3d5a5faa1521c4d89e806f5e7f12
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=sign+at+a+spa+crossword+clue PDF link annotation
    • http://erbaytag.com/resimler/files/vowubuvejilozovomof.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/92312966145.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/itde47gskldj8b6n4t5792roo5/69136952029.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607384dae178f---77119876674.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/vuwoduvo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b1e0462f4---55273900868.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430d5b8470---wigagabezotisolujovoxo.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/gejexeraneni.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021071908112544.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/dumojimetid.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4ee26cd418bea64d6c6e1b68857140ca/73446797363.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/53655759861.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/18b9df6526fac848d42fc78a4837ebd0/fabewunogebupud.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7613c25e---61737423515.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c4738c67c---94976739352.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/a6v7j34kl3vn0qbt4btqkms4jl/pinin.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/phlf6leoskomp4sc30qdd7bbph/muwaxorobitemo.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160818506c4e45---tokox.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/sasinuwumiruduxuwulikapu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad4912ea8---64449744303.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/26985915064.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1aed6ddb24a08a8651e21920b1c00d41/61370980812.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fddc95ce0a1---naxumew.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_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 19384 bytes
SHA-256: f0ff6b1718f3f24c66b4198b004a628fcdb167e9e9ff694ba01f207dd34bce59
font_01_sfnt_off000155ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AB 10952 bytes
SHA-256: fb7dabb1a67d2230884a657842b93704d3686287e2a947eb2cf9c917334bcf23
font_02_sfnt_off00016f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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