Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f5adcc642430a3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 14:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b72bc6d80975f2883fc7ae34b9854d1d SHA-1: 4ce8b0334ab6b28738de721a8c57b19f3e5a114e SHA-256: 20f5adcc642430a3ad6b0fe4342a0eef0fd198deabd1c70991cc1b3e298ccad6
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are hosted on compromised websites and serve as a link farm. These links likely lead to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://soportedevida.mx/ckfinder/userfiles/files/fesupusamidelidumen.pdf In PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0bf282a92be82c4f5501b800f1675096/sadet.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/jesexukadosogikisakubal.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/91206622342.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/fekine.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707ba36b57---diniza.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/55386621411.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/huhgk1dnbiniegpvbjhrnap3k6/1862163832.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/82170574994.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/19664411042.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/58507948792.pdfIn PDF document text
    • http://snft.ro/media/file/biregexiluzif.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/r3us46qhs145kn3v4dr2kuno2h/43268365569.pdfIn PDF document text
    • https://istanajp2.com/contents/files/22802597184.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161370f3562a1e---talawaguvavizataw.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/09cdf175c307096aa5823dff341a2633/lisob.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e803ba51e---bejeragoguduwufaredu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/demifopojos.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/630b6f1d298fb8be086f8f6db74f5e06/83340279761.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c81767f1d0fd6d41184335b04ffc2046/89584826283.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/dimalowimawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=7+letter+word+with+2+v%27s+and+2+e%27sPDF link annotation
    • https://easyown.ddproperty.com/datas/files/jetoziwipurivogafuvilede.pdfIn PDF document text
    • 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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 18208 bytes
SHA-256: eb94c2b0d95f908e60a90a95d520ecee3fd919d7b7c2095946483db213d3400d
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10604 bytes
SHA-256: 334792b9ffd453ca89e4b1f3f7fec35f6a2032900974847c286626bf80229262
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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