Malicious PDF — malware analysis report

Static analysis result for SHA-256 4722ad207a29778f…

MALICIOUS

PDF

91.3 KB Created: 2021-08-05 22:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: efec44337f32a6b4dce9f8bd108a60e3 SHA-1: 2f726a2e46a7f643b9d176fa539d920628ee443f SHA-256: 4722ad207a29778fb28b6d3476d7fdcaccb8059c986992989c35d3f7932ae88b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=leonard+cohen+poems+pdf PDF link annotation
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e156e67da1f286eaaa62ee0d8dc54a90/98678785344.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wuforut.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/pizurulefisozoma.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/ludadofunomuramu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/nji8bilau555l7j9qut5unl091/dovejivisoguzixajex.pdfIn PDF document text
    • http://akssert.com/userfiles/files/28106899694.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/73578232.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/biberuxe.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde272948f---49726665144.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nowifibimosavifub.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ded24658---30804349054.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210714060343.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ced0217f8---59370185120.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1117c3937---57751075643.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7f4cdb3899fc2b83b5d69554573e817c/poparumorudelirag.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0c36e56ff860e7d715fe309efef91bf3/vuturivexudo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7c80da0c---werizanepudexup.pdfIn PDF document text
    • http://888chji.com/userfiles/files/fevutavumodatuwipopogo.pdfIn PDF document text
    • http://unsersohn.ch/images/file/malukeb.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/93532100190.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/mopededawul.pdfIn PDF document text
    • http://centrons.com/uploaded/file/11509596736105b0be3e86b.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/lataboxaxavo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/12355948230.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f833a8b3b---54992206543.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_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 18252 bytes
SHA-256: 641a6c7e2e8f79fb25db4a6aa90e8634a9fde266579151b0b19beaf4dfc187e6
font_01_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 10604 bytes
SHA-256: 586c714c9cedff969dfb09f2a6417b2b463e646c0e46d5908743e0b971ab0e6f
font_02_sfnt_off00014550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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