Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e40b9d09e5d291a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 21:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0afcd6bfe4ea5c11290c14ac27b88fd5 SHA-1: 30b1f3e991d696a0f5231b08194291ce4f1286d1 SHA-256: 1e40b9d09e5d291a12a03718d45cf9173102af4d148ba01297e499bf561f8a9e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links strongly suggest it's part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9db0a197---tulerisoruxikifegijuna.pdf In PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/wufogigijelesigesunaz.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/971644a7833a94a33039b179ef6b3277/86169920378.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/dejigurerudelegitene.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a290bf4c2df---bapuzusuxujotuvawerefula.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/42738045305.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/11092603669.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836554f0376---kogipumedogunidu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u9dhsfqqs7s4m44ian7irmd9g3/sudebuxizava.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7163ddf394729595b207ac08d31db53c/43710806419.pdfIn PDF document text
    • http://esistore.de/userfiles/file/45863070953.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/39560220236.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/1435053029.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/358d2a6bf3628bd69bba93239f2c731e/92647521700.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/84260301859.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/da4b7c5123320c8abc0c1527c912ffd6/23838715775.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837239029fe---36166662763.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/relirufumew.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/41082243884.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/nobugojuraxagizaxebukema.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/folubukogejejejudobimem.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b0c8c8db---megekijawiwotuzad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ars+poetica+full+text+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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10692 bytes
SHA-256: 239f6eb1a8761ac5deed7b9287767277f4b4793502281aa2495e11a2b5a2de60
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 17192 bytes
SHA-256: be6845ed0f659c13d82c52ee54b522b95f4709c1ba141c7c7857018a97bc32e0
font_02_sfnt_off00013505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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