Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebda37c680858b9…

MALICIOUS

PDF

97.2 KB Created: 2021-09-04 07:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3356d8165178f90b96f5c25a08a1cc4 SHA-1: 46a87b754a290f9df80653db4fd5a6e059c09c78 SHA-256: bebda37c680858b991f246bd951879a979ce7cd8eb644827f3d9c5f8b1c67eb7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://hygradeinsulators.com/images/uploads/file/sepawo.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a2590f877e1e362fe33581a3ab9ca5c5/nadufusupivonogutenikuxol.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15b4810c09---8562593678.pdfIn PDF document text
    • http://plncse.hu/php_data/file/piwefewogugudovejunir.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5b9d8745---mawumojerugijamokudawew.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/55394421899.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8bfc4399b---67004277601.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a667e9c224c---kewam.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/bozemexim.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4dd3294e4---60784455602.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079445e87e4f---84653914103.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/memoweraxix.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081af6a04681---gaxituvesoditabafub.pdfIn PDF document text
    • http://i-dron.cz/data/file/54574390780.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/q587iegak8nr2qknjqi54vb2nu/89162318146.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/jotuwiwek.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c267a9cee0f4b1d8f5ad73d61fd9935c/ruzapujokifetudenil.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43583843d---gifud.pdfIn PDF document text
    • http://leton.pl/userfiles/file/lawiseror.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/32637047764.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/lizawaxotetopuvewabitakow.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/tolosukaleriru.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/rewodiwo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785e03d2bd7---59769194690.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9676989d50---pudawurixewetutifesovora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=milady+chapter+14+pdfPDF link annotation
    • 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_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 17732 bytes
SHA-256: d66c3c3e26fb7e75c920aaddf6e558b7ff2536b1a433da5260dcce5c15387a6f
font_02_sfnt_off00015ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED3 10560 bytes
SHA-256: 0de82956ddb5a4add4a7376ff5c24f017a5985a2816edf822da90f30fd390686

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