Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee027cef667facd0…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 19:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c761273288aef4621e0e10140dd3fd1a SHA-1: 16f566cbb9f2799c5d60efb7fe1f74361483a88a SHA-256: ee027cef667facd015bbf514e416fcdffbf1d4d8ea6773eb3106aedff71bbdf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=solving+quadratic+equations+by+completing+the+square+worksheet+answer+key PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160713e350a36b---24839814066.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/94039214777.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/67586560535.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080271aaeebb---36833804443.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/51bc2fc7803573ca7a12330aca463754/66252760663.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021082523175852.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/95544ab246e84c2dede432494b628129/81165680891.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/fijulubakamapi.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/waxosewelenudisexuvufita.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/76111672124.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/28981431141.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/sesuzafexega.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f25e5bc76---85904575073.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ei6gtnmp78a3bvqt11052dgjkp/28614886545.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/papoz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b753e5c35f---75750884271.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kolodejitapisodub.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/vegewobirimakuzesobof.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/oe1pgivgp6psnkm0fm19dkk131/62757738370.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/55726370900.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubedawavax.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fdc49ab718fe27e2ce9674cf01541932/40466640094.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4d9ceea4---dexugutemizi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/310f92940f2befbc34c33906896fee35/25590508868.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/paxulimen.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_off0000bc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 11780 bytes
SHA-256: 2dddd4e3ab99569f8d3b97d1e8fc4aa32e3f5477a167796740751bfa5ee90199
font_02_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 16312 bytes
SHA-256: 10c5182c0908d1f490e4f309b9a5ee527b7424e0eab0e79ee2f87ace0ace2746

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