Malicious PDF — malware analysis report

Static analysis result for SHA-256 a363e3158be38d4b…

MALICIOUS

PDF

93.8 KB Created: 2021-08-02 11:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a0a63a9032a312aa9b097bad8ce634e SHA-1: b753007387e73378fae25665cddca8311c5a3d59 SHA-256: a363e3158be38d4b33aa6a6bae2bf69dca6ce5ee2062db655158bf3585963f40
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links indicates an attempt to lure users to potentially harmful external sites, likely for phishing or malware delivery.

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6e20dd5c---ligekolemajosilivesa.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/229b73deca88b19e3e46d35c9a3cccbd/98968889649.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/53149483788.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c3c0f0b3635f015aaea253379f6fcf37/90307322714.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/766aa4da0c6e4105b05a388155a2ee7d/gekisorok.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/20fe2969e6010b457fefff7930a03286/bagugugolevinovuvupoxus.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/rugojef.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/goxuzanevawokanevibe.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/17160430700.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j54dc336m17d3fvobphp30shhc/71136295376.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/eeb17ffc691f5420b8774b58484f3e25/63562817177.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102ee1c32b98---fimakozine.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f33e05bec---57347532085.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/gukize.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/35905409636.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/26147490228.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1625673724690644739.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcb836082---66505909915.pdfIn PDF document text
    • https://kawanmto.info/contents//files/vinarejoridaligisubel.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/52cvc9q9eep1noa1elgipel23f/33275200167.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/7a61733219b0a24abe56a65b968e7044/damemakefoxuxemixov.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/361692cf558414b9acf9f36fa99b6520/19362727769.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0160b2bb94fbf3fb67aaec2588435d6a/bapojozebok.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/clerlgu4h5fhnmj811v1r0moud/ripiwiwidudewu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/crq7fe08mcmr3um10k2mhi5b44/fogelokut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ayyappan+swamy+hd+wallpapers+downloadPDF 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_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 10648 bytes
SHA-256: c444bd830bee723d38030886b5c4e2e02568b04b8e14247c75142e46061704e0
font_01_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 15156 bytes
SHA-256: 8249cc6a43d58acd3fcd71e4a788c38602b10cd6b7769cfeed3ca2816608ba5d
font_02_sfnt_off0001511e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1