Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b75760ac7119f48…

MALICIOUS

PDF

81.2 KB Created: 2021-08-30 22:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be532c1522461178c0206e4556291606 SHA-1: e2187447a6f4b5d8029e5fd99652b5a91133a6c7 SHA-256: 1b75760ac7119f4850b7f00bd218fdcc7591cad2e106d0c71bdf685cbb0bbe89
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf169bfd45---wikivo.pdf In PDF document text
    • http://gadkowski.pl/repository/filemanager/file/53435090467.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/082f150c6b94b04365b8dba7466f4eed/zevisovoxaputabedesetos.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/07cc0d0a5d15d2a11e32efbbec2d4975/97208664902.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cf8aa9ee6bca92b81903dac2724d6b34/najesexemifigetututezup.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/juwimipafip.pdfIn PDF document text
    • http://dzbnf.com/upload/file///gasekunudipuvete.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402edd1871---kavoliwafagisomugokiv.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xabimogepozim.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gt2mmlgr0qphpgd2jp1skrq0up/bidegetu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089814b7b527---93701164139.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160729ece053af---62002870406.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/nkjbcfuh46937euec1l25gepa1/gosidasurosojebidulu.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2017924557102206e59a844a0c9c84d5/vasagiwolu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/41772911731.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vggahfg7306s73ee38ouenm30o/95479078932.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc26e62c6---batarad.pdfIn PDF document text
    • http://charontrade.hu/data/file/78452418604.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/88464255028.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/mee1uc6c1g0ucai07jha4t59o7/kizozugod.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5376d4ffa---44215754019.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/78800768213.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/80457639792.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/68721883377.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160856224ac25a---58815267820.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62f6570ea---29992446234.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210731_86EF826BD159EC67.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=3+unit+multi+family+house+for+salePDF 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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10768 bytes
SHA-256: 001a49630d48f6e45791af5a6940cdfb68cf0c5f4b79b0942d58709633089748
font_02_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 17872 bytes
SHA-256: 7659f9af843e78f05b88db6242abcec8df98559f1fd24ca05ae8b92d4ca4baff

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