Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90875c5b1f28d1a…

MALICIOUS

PDF

95.1 KB Created: 2021-08-08 02:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 895d4b99b5e9ef98bc06919fea5f9772 SHA-1: 7869f66abfef28aed17426de18b1d797b03b16b2 SHA-256: d90875c5b1f28d1ac9bb54fc78f892863f89e4f551c3ed23104c21fb02cf905f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into clicking malicious links. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=how+long+is+recovery+from+shoulder+decompression PDF link annotation
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/30be2e0d3ea10868378a3dea63745419/domalidaxaxivobovarizamar.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/bivixadivoximemak.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/43987856343.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/35132066533.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/afq8fmbdi2o6mv9ckeqf83qsqn/66146241693.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fb57c8a72684ba1c931fcbc7cd772cd9/76476570680.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66711d81b---towezixefosonorud.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f4817853---30430554128.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/83938668202.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24ed36fcc---waxisenakali.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/234d3c7482b3ab1449fb16c4db09ae45/40663138278.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/refeniwe.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cuma2hrlr0auv1f2vhh79pm0eo/54944819777.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/kositixajowasekaraluraso.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/93425522997.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kupura.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b54e0c1d75---86962462207.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73c40f99c---28196446851.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/64607423898.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/31114491572.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072723095263.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dadfb6d32---dezeguworoxasasepumopakuw.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf221c93b7---wutifesawor.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1e59a740---20401313545.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_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 17556 bytes
SHA-256: 8728447c974fe7d1a3939d3d260421b0349a6d7afc2d86b444dd98283e284f92
font_01_sfnt_off00013b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15337 11164 bytes
SHA-256: bd3964800bee719b90a93e7308e798b2b8b303b89b40455032ae123c64f1590d

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