Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49d7e75a68b89ac…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 07:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dbb8727fa892ceb722455b00788235dc SHA-1: cbef056a934b5abb651ce950d9e532adc5d01f51 SHA-256: d49d7e75a68b89acf691fd80dfe22252178286364522d2b0c7c2257bf3a4b634
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point towards a social engineering attack aiming to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://alexandrapanayotou.com/web/images/static/file/wawurirubegolajimuzoni.pdf In PDF document text
    • https://projetounificado.com/uploads/files/lapizebufosabomunolozu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61002ccfd1---tojakezabox.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/zapogotumiturugi.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wikekafipiseziwe.pdfIn PDF document text
    • http://stl-hk.net/userfiles/26974031982.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089f15425e6d---164992192.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/93376934687.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccf5b4b0d---48600115119.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/jenigefa.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/49908059194.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/femuvixasugigotexa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf267c11be---perejonisapuvu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/13368772887923997c251919d81078f7/71564122206.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/jabapekasazoj.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/mibasozasorofixi.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6a7a4e7dde328517f3edd7fbaf170410/sogesufojiwenuzedaxegudar.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376542ec6c1---busoputu.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/69640938097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ncert+biology+pdf+class+9PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4e48a94050873342ed3c18c84d57a182/73145055065.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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 16928 bytes
SHA-256: 8dfd0ff58605f2fc43d563f9f824564643fd45ee8b0f84618e4c2351ec83c605
font_01_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 11088 bytes
SHA-256: b3bdcd52a38ef073be415e153d6442c6cecfd1974232916a9af99dba9f2f0cf4

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