Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c19b24d5528b2a…

MALICIOUS

PDF

80.6 KB Created: 2021-08-03 15:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 839cdf6ae52e97061c39164300e0688b SHA-1: 9ccd761e0b00e7e546d0172c86f7fda8d1587413 SHA-256: 45c19b24d5528b2a32108dbaa473670102125dfdca532d23be4c990dd88bafcb
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9981

Heuristics 5

  • 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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb136ec56c---ronuxorepufatose.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sfh1dsbos0h0kb4erka0h698q3/dasopadexunefed.pdfIn PDF document text
    • https://majubesar.info/contents//files/buliza.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e3f9jf2rn8dk7od0jeqqjb53k1/62558403299.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210616163158_2117698567.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e1f58de7---77563433737.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/zotufinejoza.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec893d21f---tamezosefikupiw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6cc2i7sjh35os5bn2umqt7mrg5/xabevudonanoja.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/dilixepo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097f64e1249d---sisatibadidolixuje.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/64801640804.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4f549f6a---nasepemipujato.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/giwodujamo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/39496978469.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/65460118046.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071896885234---pekibilawiri.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/t114ueerpg3mco88ihjggkfqha/88671984652.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/248513143.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/laponogomopinazurimitum.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/64789096356.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tfrki9plp8v74injnmavdfu7jf/muxovadoxaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dr+masaru+emoto+water+experiment+in+hindiPDF 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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 17380 bytes
SHA-256: 15f6a0a6151091aba4c532c377206f6a0c1d0faa9fc52515e756f1da2ffe1d22
font_01_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 10900 bytes
SHA-256: ac43c68dcb06b5f60f6ffb899cf39dce78949f35e504b081d2090e35439fa2c3
font_02_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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