Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a66e867e1f96940…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 17:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 774c5689145c9706d8090ee6468ae8cd SHA-1: 6fe128533734358fbe189161a7d5f23d19ae1af0 SHA-256: 7a66e867e1f969409987c2cef3c7fc2443a072839b125b33754acde155b1b65b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for link farms, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM points to malicious content hosted on compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=john+wick+chapter+2+streaming PDF link annotation
    • https://khabul.mn/mmpa/userfiles/files/24939694747.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303dee622b1---pomogupanivade.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705c28cf6---wewedutubelowupupipeba.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/46133760845.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/49188441026.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613678a9c3727---vepelibu.pdfIn PDF document text
    • http://lg-palette.com/upload/files/5511217228.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/buwamesugumuzugu.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/fusaminizukekixulosix.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gofodepewonumes.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/98377509502.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/30771467589.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/16233065505.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/pevebewat.pdfIn PDF document text
    • https://ms2oke.com/contents/files/78953073870.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/16838478820.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/guviwexinesosokagivugikup.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6500c65a2552608acf70211b90935156/87382244564.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/18120588658.pdfIn PDF document text
    • http://a899.net/userfiles/file/jemegoboranevevofofogij.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/39600313758.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/66962053237.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/sometafigurisatuva.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/vorujadupuxav.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/sodomazorujexusavufotuza.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_off0000be7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 11064 bytes
SHA-256: 08d67a101600aa456e2f031d2b668272e415f57690310e01bf687c61367703b8
font_02_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16264 bytes
SHA-256: 0f0651a47f2f2b8cf09e8d78c59e3535f30c542f1c06585b3bd70ad1edf2d99a

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