Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21d77da82257d9c…

MALICIOUS

PDF

91.0 KB Created: 2021-08-18 07:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97566c3a36625895d05974a37d99bea2 SHA-1: af1a715aec6ee685364d5be7af4be4b4298989ff SHA-256: d21d77da82257d9c669a3db4ca5853cf185d9993f25fec5e1952733a1e564f14
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of multiple external URIs indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://arhometutor.com/userfiles/file/71408344725.pdf In PDF document text
    • http://kaies.cn/upfiles/21061408002527403079uase.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/534759b6c80e8aee72bed30481f80b6a/tanufofenizikorawitipelaw.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/wowinupodogupijo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35f3e5cb3---94569046998.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/kumijeparejokawitazijev.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/rodite.pdfIn PDF document text
    • https://guijek.com/userfiles/file/6653326609.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/zamewabosotiruge.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/kagatavozirigokawapajagex.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/sogotekobefetatufozem.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fb2008e8cfbcbd9a07c75b54348feb4e/bojeketudiniwerivijed.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608373c366526---pumipekisam.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160941048377a9---futorisanewozipinepuripos.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210806002124.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8mc57g2uuj2rlfhas8pjq9pt8f/49434759035.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/turofikozusapat.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/14655559796.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/79798634113.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bakira.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/12446614133.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/4gpfn6ijtfc0am99i8psb0q1kg/95662306462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+rouleaux+formation+in+esrPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16092 bytes
SHA-256: 98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 18128 bytes
SHA-256: db002fe90db4e26fdb005eb2cc25b7c59b0e318525c896c02253c2537b9ac65a
font_03_sfnt_off00014470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14470 10672 bytes
SHA-256: b8b012f585d6dade55bf27904441501dc29aa7abdc30d786da7bd8947b4c68e3

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