Malicious PDF — malware analysis report

Static analysis result for SHA-256 f819f9ccf597bd79…

MALICIOUS

PDF

93.8 KB Created: 2021-07-14 05:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0907c2015d67ce7af3a3e2d621069a36 SHA-1: 70373d5c642b117198d57ca23fa57a3de39e97df SHA-256: f819f9ccf597bd792e71fb117b1543c54564c27d8ca6c2d3ee4e57c7af888ce4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting it is used to redirect users to malicious sites. The presence of numerous unknown URLs further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0v1uv9jn04946ord1uir6k8tqp/27539217439.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cl0tkeds7bhdp6vho382ioe9c7/navamazuduja.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/zikunipagodekuwipirebupad.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/344797739c92cf47112ec3dd6eded696/8436725566.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/96456339595.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160782eab2d738---semafibirenaluzatidapin.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/043b502e9f1843f5ec1aee0ee1ba209c/wisativeguwuzegap.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/mugulujamemapule.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/96813079298.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688ce9239d---kalesunevizowazopeji.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/rexexabomozaxof.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/zofav.pdfIn PDF document text
    • https://emprenderem.cl/files/66063526300.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e01ad87ca---vodumi.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pofanigigumuxenojibebunu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3ea013e3---87472973959.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/xuzajata.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/34311444926.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/vorebogodajobolisa.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca1ca62bb9---61767769351.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d787671404---sepaxuzedifewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=which+one+of+the+following+is+a+factor+of+productionPDF 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_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 17136 bytes
SHA-256: 10980e0376b035aa494b94199e97d36c65d0c787a8e446e25580b9af29386c07
font_01_sfnt_off000137ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EC 11080 bytes
SHA-256: ec7a81d5316d3fcdc043c088ddd87fc5686082c4091d9c5c98015303247e5ad0
font_02_sfnt_off0001518e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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