Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf37d0fc5557df5…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 12:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52440256236857f153541680ed71a958 SHA-1: 35a7a70f165a0f247e659191bfe454994feb5405 SHA-256: 9cf37d0fc5557df536f03f58e73278175f4f1a3518da0635bfde105ce07574d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=mark+and+lexie+episodes PDF link annotation
    • http://digitaldaya.com/imagenes/file/bevimoragurixolelolozakoj.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/89010025376.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/37038505670.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/51b23bbeda23243d9c9719742833a100/59859422870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9989bb317---vujutolemapugulomudizuxef.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vhgo2oot2lbsvop7153lm94nqv/75041343348.pdfIn PDF document text
    • http://panificioilcavaliere.it/userfiles/files/86216521300.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0ee41e487ccd1ece99b469796bb35d33/nebuvewajarezodizesunif.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68123cb7ce---13084860718.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/862a6bde3a05a838beb35b8788a7c5f2/47335134805.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/09723e28bb3fab49d6327ee71d6c6653/rufirevaseb.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/sozatimonimesureb.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc96eacbe1---jobivo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1707a1b041---vukoxojapoju.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac490192260---rafaviwedosixoj.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8bf9fee9---bamikorexu.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/28098401757.pdfIn PDF document text
    • http://ahchala.com/img/file/59835056364.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609c54ace7608---47580991059.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ad72555---92314487027.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/gaxagen.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c76fd583aee---kulobotigaxaponinimulox.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_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 10472 bytes
SHA-256: 91f44b731b37a4c8e2006d9dc1512cd9a7993655d1d7bfc87205da316cd0375d
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 17144 bytes
SHA-256: 2fa22f17a13329414feb95d846a021740ff9c037aeff4583e7397fc83d4f13d8

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