Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb3dd9a0b304685…

MALICIOUS

PDF

90.8 KB Created: 2021-08-02 03:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ea869bba1a98effed0d9e254e9fea07 SHA-1: d26b6c1fb026c6a8d35781d15e6d75f29f3620ad SHA-256: 4fb3dd9a0b3046857249b730ce847d60fd5d155f84bbf717602ccd39a9a0e258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://queure.ru/uplcv?utm_term=ignou+b.ed+admission+2021+last+date+extended PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084531740b6d---kuruvevezulazovisi.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ps9b89qnple85n7jnj1apvuio/nusepumor.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/rirobuli.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/34239019512.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba781819040---69390392608.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tigosepa.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/66559490923.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1268efd0---75769972702.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/49127995942.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4edea56f---vogaxuligokulemawor.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cb093eac7c3e4bf8280a2925efb221e0/48116771049.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3902272518---jujamisurebotakujisavo.pdfIn PDF document text
    • http://yuha.be/_files/file/pevaweguro.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/11547411958.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/8340515286.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/peredijala.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/figedukubifodumekawen.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaf7521187---madetobok.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/2772804278.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/mijalowalamelijeborajusi.pdfIn PDF document text
    • https://coevent.ru/upload/files/27701884664.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d6a7367ac---33540308614.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_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 16776 bytes
SHA-256: 28a312fe2fab33736cded0e801b2cb458221ad36280489575064bd582f5fc631
font_01_sfnt_off0001299c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B3 11144 bytes
SHA-256: abb07c1b727e072e18acf9cb4f0ae118b1a9cbe990811426df7b691f3383e037

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