Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa58c1a52daee48…

MALICIOUS

PDF

96.9 KB Created: 2021-07-22 08:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e53b82925391c7310eeedf554813581 SHA-1: 6d52e8374e070545cd9adb2b5d33b7f83f8190f3 SHA-256: 9aa58c1a52daee485a4498e614459c11e3b6bef1790e08bcb36af842bce16ba8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, many of which are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 6

  • 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.
  • 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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b01ddf4ff1d706d71cb9ba1175fb2926/ruxelowunalometugutaxabo.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad11d79d5---mesajofotedaketonegowe.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/65806921201.pdfIn PDF document text
    • http://topjobsnepal.com/ckfinder/userfiles/files/92730312283.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1i19imd4cv4osr4kso5jn14ohv/23568554962.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/51818931288.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/44395f0fc9df124a8fb687723179cc83/73725432928.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c2135af411a5de11a309af8b8b441f2c/tesosinubalelidemun.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/buxamabujisigebenefero.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/itc15o7t7oak8hk7e6rns75fk1/gafivedalenedomunifa.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b2957cc215730de8cf4e36e1c88f7e5f/67020397633.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ab2b8e6b3---15117856954.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608089c10f895---59979396065.pdfIn PDF document text
    • http://firegallery.ru/img/upload/67863978529.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ece629c9918d194d66515db33abc643a/lexemetetavijuladajokisi.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/gisiwabilelemedewejifu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f4f27a70c---83348287980.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/vifebipisafakaxi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6e9e7d3e23e688694687e76afecddfa4/levodukavubiz.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/14ec0ced51b55d373bc855ab81d00138/36406299095.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a179d5a84e3---33880218654.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c6a2defdfa223f6791b4a2c1d4abb4de/ruposovabusosovi.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/e46a18b9dafe712f47f702a3ed8d65ca/xusobeworadotugopavupotop.pdfIn PDF document text
    • https://people11people.gr/uploads/File/fujekux.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9e41927d2116af863b9cce26101a4d05/juvanagujijurovuvudox.pdfIn PDF document text
    • http://soupworld.de/upload/file/bidukavuv.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lepowutoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lord+mobile+apk+obbPDF 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_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 17488 bytes
SHA-256: 38005b84f5de7cdb3889376536763397779c04435d4d29c23e9ac1ad24e12b18
font_01_sfnt_off00013138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 10372 bytes
SHA-256: 66bc2e64b0327eb5cefb84a53dc6b23f99c9b32adfcfd6d4e6363788cfbcb4e2
font_02_sfnt_off00014857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14857 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00015dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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