Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3955333ce237741…

MALICIOUS

PDF

91.6 KB Created: 2021-06-28 22:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9e95830850efcba8a0e83a410aa1494f SHA-1: 1a7f7592d10c393cbb5014b77c6c82308679a9ff SHA-256: a3955333ce23774104380f674630efc6be879f4783b4c157adfc74af2e3c9902
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://synerhu.ru/uplcv?utm_term=prince+of+arragon+character+sketch PDF link annotation
    • http://bestapp4u.com/admin/uploadedfiles/file/83446307822.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/318f60be6a085be42cf487d8f2d3e282/sitegoko.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3ddc80732ed92c9256e6457f2738a48c/5949104582.pdfIn PDF document text
    • http://fullx.net/files/74462299529.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3968e1e3---5976172325.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/9771830517.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/95031654451.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/21030fe695afec0d6a6afad89503f409/bupolavukusejajejewakuw.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/21kbhpf3mgv49s1e4i8ufbnnli/gamirutorudonaluzokezi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160720b0849fe1---vagase.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c9c50571---78655342590.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q1ji71j8lnra7jo604l35uvvl0/xibetunidabejaf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/492d3ec23fb80d71eb94dbe5073f833d/99958147715.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/23016987078.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/67533474546.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/89354716932.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dadc36b5576655d7b902b55b305e61b6/78760059317.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/zefosajalofor.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/12945807496.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6dd0195c1---80092974311.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb3f4a425---minejadejebakuxidupifovef.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087c105d5814---1917538530.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061301302382.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6545b5a809---42220253682.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/fuxinediwid.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_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 17072 bytes
SHA-256: c095a3564c046625d9edd784dee87d24dbb075702009d3004d0761f5b5a108e0
font_01_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 10664 bytes
SHA-256: 938c126ff4d66f88c34db1903a37d283940e18a2495acce9576e22ae4b4f0e3a
font_02_sfnt_off000148ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1