Malicious PDF — malware analysis report

Static analysis result for SHA-256 76eebb88fa216d93…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 07:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 20030beaf3d94c33fa572d6f4fc9548e SHA-1: 5b39408bcfcf3f09374adcf82b62c9410d062a51 SHA-256: 76eebb88fa216d93f95f4e5faeff187cd7784dedf0ac02971ad1ae953e8aa191
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various websites, some of which are hosted on compromised CMS uploads, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.huescalamagiaenfotos.com/userfiles/files/pitovon.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1prqt0jao4ldc0r92o24l3p7d5/88677028558.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/solijogagutorufakig.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160865eb07c04a---34044751533.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608393dd36a74---witovonapejusekeloluta.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/6250817624.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/68705500832.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/tivogok.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/7293320500.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4505e6f7---diguwobizotapadawizuziv.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/fenofizapowezupitirerabus.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/10565819082.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/10600830525.pdfIn PDF document text
    • https://hoavily.com/uploads/files/dananusexibapepowoboxuf.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076508c9009f---vidalumeroteduti.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/45299108484.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/jewodarofutov.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/5618334587.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/mutumabujuxudeja.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/sejolojuvanonalolinajaxit.pdfIn PDF document text
    • https://southafricapools.com/contents/files/xabasivuxuwikedulofugot.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/waseloperilajixaxiza.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/231a01f9b9e8dd4ed695cc5aa1a46f13/palovosasaziguzezug.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/22179381565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=basic+formulas+of+physics+pdfPDF 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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 17868 bytes
SHA-256: 64115e9a7b91009c7e0dd4deeb09a895a605da8e62156123220e35652b9e6f1e
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 10816 bytes
SHA-256: bcb2cc58ac65af1d9441a9e3cd2cd6a039b410d271789eb111ab9d9899fd5239
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1