Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e68be936c0908c…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 18:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9899456cf36db655ec49170d638afa6d SHA-1: d31b629e213efe294290b20f824a8785bb7b1a35 SHA-256: 12e68be936c0908c3a4d7d0c35efa9b5015d68623c9a365a3c2045c0f84f0ec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=12th+chemistry+problems+and+solutions+pdf PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/71ofq9ulep8v78nvprlqm7rek3/25469482563.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/7312432992.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a45efdb0598---soletatosaguxajipive.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/12310856227.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6ab4443bec09b37715bee57fe629ed6b/kitejiwirumejenizezaser.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/22903498051.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17132d88eb04547d9d9018b3550d5ccf/betopewuna.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717416d2e18---newuvikijafiwukonu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cg7lmns3ed0hljhqmipjlnmoem/66631346689.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/57763974976.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/doselofadasila.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f94b12ad4ed65601cc0bf2dfd49ac58e/5538679818.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/97153248012.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dawunexi.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/17697064860.pdfIn PDF document text
    • https://attack.lt/images/files/kelekimarakizejawiv.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/42737930049.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/54664801851.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/zoparupemoxuze.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ed6afcb4fcc389d4477089ce034459ee/xurezuzizemidegirexozan.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/49251696396.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a500dfc00cc---tazodizawumuxigivop.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba70160413---30174602106.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vuvimagug.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_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 11316 bytes
SHA-256: 09c70613dfb09910e1d3caa0a7f1f9a7cbf8bcd1acb61177560bb662bd599a99
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 17668 bytes
SHA-256: e6f8a9108960066e6a9e0735bdc6610573e335359df5682e57f7f402c73d30b8
font_02_sfnt_off00013487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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