Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c968d67850cc3c…

MALICIOUS

PDF

78.6 KB Created: 2021-07-04 11:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 201f5198c61e75582c2b891e926a7304 SHA-1: e1e4bd5e5552e78df289b557965b49577e01c9ba SHA-256: b9c968d67850cc3c2a39ab2c6c23e7d41281b7799747ef2e2e1808be95e19bfb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=friction+mcqs+with+answers PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3569b52d7---22208136532.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/29936251612.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qpjtkholsne5daeij0vl62vrd6/negaridinibusijipo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838fedbf064---novibiloxolobajunal.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632c640e8a---jugazem.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/98384354480.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/9bf0f75817ea60718a4261b2eaafeac3/vemexowitokokex.pdfIn PDF document text
    • https://4appsoftware.it/file/28810552469.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210625064912_642779129.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v7a9od7ot2fab9bq53a6k3h2d7/44518735032.pdfIn PDF document text
    • http://iwishop.hu/file/99291549082.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04dea259b---fisamekekejejol.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f32e339c---15705003224.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/60285675314.pdfIn PDF document text
    • https://loctra.net/userfiles/file/lubar.pdfIn PDF document text
    • http://akita-inu.lv/www/files/files/45440171123.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f62ea2f7d1046dfd3a155d03ea9272fc/12378273096.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1b7b21c760d9e942d734832e50680e82/91237402323.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/12600945247.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/roxemib.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd0314c6b---xitaralog.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/87047836176.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/62f161283c101babbeabb1d20eb265de/19400301041.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/22277036978.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/92261687457.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/29478446578.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_off0000d101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 16828 bytes
SHA-256: 074660ee875c38fbdddd7ae2df341a58f243c70c2074c8cd9d9ddb0a8bdd4e91
font_02_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 10660 bytes
SHA-256: deb2c07eb5f1b94ff1f5fdcaa96e0b3a5010612677c955728a94a7faaa7e18d8

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