Malicious PDF — malware analysis report

Static analysis result for SHA-256 f940d5b2168385a7…

MALICIOUS

PDF

89.1 KB Created: 2021-08-08 12:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9f86d464a79b36d670ceba17022482ad SHA-1: f94c96b2f3960e296e247012a6d651ae9b2f6019 SHA-256: f940d5b2168385a71c588fb8acd786e5771dd61cbe5705df5c0c1da797066c80
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 CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://gorisum.net/fckeditor/upload_file/file/41221192208.pdf In PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160869af6c7499---xugunaluwiverajizamu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b124d905fb---30439563231.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/silunarifugatufusisova.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af79dc97c4d---nuwefikodofewax.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e24479a781d083a25749583c75f1710a/78973958420.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/xegiboji.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9ae32553---taxajeze.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/lokedexopewegewoloremo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608858db04c29---jekasurawonijubenigumasek.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/zukusunovaw.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/11462028977.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad94b0ab05---80716150633.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/895475a9228d97dc086cae553aee5cfe/87433623449.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac310ce6cca---luniwefamitipajimibotu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a77ac96332---gitadozazularal.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3f16d943---83921621571.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/bukepinuvilofu.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/12587198618.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5043a8915---10746003985.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/20662062636.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609296e4ce3be---wexajowetiwawoxowez.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/94533694645.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2013762d88023aae1172552d1fb82b0a/4918777714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=books+for+first+year+law+studentsPDF 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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16688 bytes
SHA-256: 19e8f9a86f7e5519951458783dbdbdd5d4186d0c1884739404225c1f008257b2
font_01_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 10792 bytes
SHA-256: 439bb4e746887e104c194025f62edf70a1d1a76b248c9d4f680b36d60bd333d1
font_02_sfnt_off00013dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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