Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddab5ef0e45df272…

MALICIOUS

PDF

93.8 KB Created: 2021-07-17 05:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b866d3a7de8e6d2b30a54163106e0e7e SHA-1: 11b66e70692d37ca19f1fd2006e42dda0e86c0a9 SHA-256: ddab5ef0e45df2723d2d025376994527d2ac9d17d60d91c1754de2571d77f864
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 0.9806

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://mertlakustika.cz/images/pages/file/mabebe.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/faguwojugebufaserozog.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/83727875662.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/makanabalulevitisimuwemuw.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6bd4d02e---71044389651.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/bovugigofizu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160816bcb83b7e---jukibemitevoburix.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/nipevuz.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b63ccf9e2a8---17704042214.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/bc19bp3griuncpbs0tkge984jd/56707080096.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/xakupepudirijoxijuduti.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c31599a7ea33f1ae714473439df2b952/buximuruxokiguj.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/98326106453.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b44ece379131099fce82e1395aa9f717/nutaxa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/pagolube.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/717a5dd04ea6484760e2386d7cee3310/bawufodedenogoti.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/101188411.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/70295442757.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34ee7cd308---xozatotik.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/wibinelikux.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/90999224786.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/dujojobafefure.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/xopipizeger.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/dab1454b37cb2d6745e2e5537fccf5c3/5452031548.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8dir00pp70kuhgiaf8orqfpcgt/96252161162.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zadudugewifuvarun.pdfIn PDF document text
    • http://erex.hu/upload/file/49665569200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=change+pdf+to+ms+word+onlinePDF 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_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 11060 bytes
SHA-256: 527983606bcfa5420f3d299b2e9d305b679256d51513b6d273d3688cc3f4cedd
font_01_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16964 bytes
SHA-256: eac5cdb4d032edb6e2b28f2e86e508a2cec8021d461b51af61aee91265e0bff6
font_02_sfnt_off000151e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1