Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5d67cc505f7c21…

MALICIOUS

PDF

73.4 KB Created: 2021-06-26 11:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97080463f7cc01fcda14f2eb338b56c2 SHA-1: ef0c6eaff316a6150fd818b838cc8046a3dd6cde SHA-256: ff5d67cc505f7c214a07f11876223c45f6300a3d3d7a5095f6b50f07efc1efd4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The presence of these link farms suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4289b4d615---69212161324.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0e9b235f---bukuxoj.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f46e4df2b42641749ff3be7202ab31e/59317632968.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/nozojikozenukudufezavuxov.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160827928f3be3---miratemigagexezadofu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fff039519---wenipupajiwubebavonajudo.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607889a6c3fb2---tugukopewinuterutab.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/2d3126e91c59237566c4205791bf1bd0/mogezuzulaxiwoton.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/m9vu50rvuk9h6j0317m3t1bo1h/xafajuvusepi.pdf
    • http://maxidmum.com/images/upload/fck/file/mupexozeganajezope.pdf
    • http://euro-ex.net/images/blog//file/48066100886.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/10095303136.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c2abaeea---49453894022.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d3d31078---woziruzudifikoboruwu.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/17b43cc84e3fbdf36cbababc3058d39f/56166345424.pdf
    • http://vogiantinhmach.com/media/ftp/file/ponivadaluvojibatirebasi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2b1679a4---98089469981.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f378c45960ac9ed0c1beb2063335674c/81974614670.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34c94a921---51299146492.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9e7a1e7b24ca259413487ea8d730944a/81923225446.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce72d447b---32542059856.pdf
    • http://automsystem.com/UploadFile/file/20210512011203244.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8e04b320---nijikaragomak.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dogexajikinogozoradef.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082313fd9287---zofurunowitofu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+draw+cars+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bff2.bin
086ebaa37d13c0ee18aa7c00793b9993e1a69683065fa5b43b5bcdda463b4b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF2 10316 bytes
font_01_sfnt_off0000d75a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 16792 bytes
font_02_sfnt_off0000ef6c.bin
8ee11df468a50b4a599bc02220b23ad8076cc9c51ae7c94b38d82a97711f8ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 15476 bytes

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