Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacdd423ffa9dcf1…

MALICIOUS

PDF

91.5 KB Created: 2021-06-29 06:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e107509e8bf29a07ec58e23f456c6aa SHA-1: ee77ecec2a9434f530c31ea7ea8505fafe84a890 SHA-256: aacdd423ffa9dcf1c35b17c88ce605f65d6deeffb8226cd5cb66f3e04b3a077f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=the+cliff+house+hotel+southbourne
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d52a20e88---lotuxofunotuminotivino.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8e15aa65f3532474aefd911ef3a98033/sixiferamevorovuvas.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a80b930e---kilupiji.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be174b62b6b---kixorowaniwolabad.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/d70d406473c9396a02644c4930a6d637/waxotememida.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb3210fe32---lusizunofufimorujo.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d932242bb2c---16985601775.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b171b3caf5773596d97137aed99ca99f/lulajimokikesodipoxuto.pdf
    • http://unesco-mediain.cz/fckfiles/file/noxedadakivaxekiderosezaj.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5e730dff---roritubesos.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61251044d8---denetejob.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3bf66c7788ab426abd0e7d43ee4a7e22/vozoxidagonolafopabizexo.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/78526105528.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e08dee80bd391243efd8b7b902a1ed17/lemegefibewun.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210527054416.pdf
    • http://jentretiens.ch/uploadimage/woxasekexiriwoxeteron.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ed60c551---demif.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c770ff3b4df---koluditigugipabubuzes.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e0b2bf7a8f8ae2872ff1818f0edbbb3e/69160765355.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77ac50735---roxelovuzowizugikazip.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/bogetologipavotowomo.pdf
    • http://classiccar-jp.com/js/upload/files/95018453017.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/7516d61fb0973baa2d7d16c57d56dd68/70416435480.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/lusuxiga.pdf
    • http://jamessham.com/admin/usercontent/file/rumevozezuvisupu.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/09e66cbb86e41eb1290e94368771e448/62821001006.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_off000103d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16792 bytes
font_01_sfnt_off00011bef.bin
ab5e7be338af40810c9739a2e0808a2406086d5a801c29c78f1b63a8639ac6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 10476 bytes
font_02_sfnt_off000133ac.bin
15f0f62645ce455024a65d58a3d22caa3989ae05b9cbd9bfc8b6b5e92a9bde02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133AC 17520 bytes

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