Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a38f2590331cdb…

MALICIOUS

PDF

87.8 KB Created: 2021-08-08 13:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f40b25a91fb423f0be88f0bfb2c71b20 SHA-1: e71c0ac1f47cd10ac19bcb9f2c564275e9cc45d6 SHA-256: 63a38f2590331cdb4d86758a29a781c887c5ff1f2c6e562464bf3aef0d99be74
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests an attempt to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://ghettaetamionarchitetti.it/userfiles/files/botimalekapis.pdf In PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6ad099452a04d487b986770ae386ea5a/68016803878.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/mamini.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/sivosibisepezizatidon.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae5eeeed3b---duwup.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d1172d93---kotiguwebelavufaxurige.pdfIn PDF document text
    • http://capital96.com/userfiles/file/musiwe.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/8184109811.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5318b0ab7---bibudukogigatujefiki.pdfIn PDF document text
    • http://cke.hk/userfiles/885971081.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d092ca2303f---87553898754.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/penosewevelinaxoma.pdfIn PDF document text
    • https://efnnma.org/files/file/43329055057.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fce08f70f---fateful.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/88563289939.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0b3c70eae737141f84cc8a13e875ac33/57242065183.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jusufepokodotote.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070e51708e85---posidonolirudasaxedaze.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/864cca6dad65f77f277e2e6350893e91/ruxozid.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/96724098771.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/39935914400.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/mojilipezeto.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/bezirekoga.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/xutorowurojoreruxagoraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=document+retention+plan+templatePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 16988 bytes
SHA-256: 18227cb6c25067734f05c198e9a3e142fbc7f20f96d5306a0fc70425836f970c
font_02_sfnt_off000138c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 10468 bytes
SHA-256: c45a11e213c992699f7b4764aff93e80e732b9b5618bd1459a1f821a557420e1

Open this report in the interactive analyzer, or submit your own file for analysis.