Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf22d191d993fc73…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 08:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8689a2407cf9c15b5c3e29f132857e83 SHA-1: 1e276b60b5e001edc1d974b65185ef04c84f94fb SHA-256: bf22d191d993fc73154bc41e4aabec7b6fa6a74571031194504766ecd73264d5
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains embedded JavaScript and numerous external URIs, many hosted on compromised CMS uploads, suggesting it is designed to redirect users to malicious sites. The document body is unreadable, but the heuristics and URLs point to a phishing lure, likely using a medical topic to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=endometriosis+pdf+usu PDF link annotation
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2abafeeb84c3816916380416382649f6/22873635622.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1ac27cd6---mozuxoniripelizetuzaweni.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/379c035ffd299c4b998d262cc360ebf5/faxifopimurakukomuru.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160851d54abab8---sanolosazudejikavuvosunam.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/gomajawagenawimifatinefe.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fde802598---tepogamazizu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160838022a0e92---xepolipa.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/jetijizixenekaxo.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/22b211cc387486f924430c365faa5506/rezelu.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/susaxuwekenirusodazazas.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/dosewezufari.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/22463cedb71f34de4a8175c9e6377e2b/11458108713.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/8483124638.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/11254323518.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/21110729556.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/sukarajevelomafotorilako.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/runapujurutobudodip.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/78883207773.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/699d2f98ecc7214fff9a6b6651250183/17634471021.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/18149241690.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fd555g0f66b6v390auv66j9nc7/51513758324.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99646455914.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/vuzigepijomagimozix.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f6339ab69---gewurezazosedetufi.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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 10532 bytes
SHA-256: 652b6538a653b62c4017e7bf2b799bc75ab61eb2ebb59caf3c46d2a7a97c92a2
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 17088 bytes
SHA-256: 1f2a0b7f9e5323831ecd2ab7df2e48f1d1c4cdabaa169de65433a3047402d6f2
font_02_sfnt_off00012eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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