Malicious PDF — malware analysis report

Static analysis result for SHA-256 de465f75d5790691…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 05:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfdce335bc917f1d3c1ce9a6538c5f92 SHA-1: fe65825b84eaf1aaeea7cdf372e42e15cd66468f SHA-256: de465f75d5790691f8cdbeebc83e595ae8f5a926f7a9aeb37b17acf9248bf764
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. No scripts were extracted, but the primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=nulidad+de+acto+juridico+peru+pdf PDF link annotation
    • https://dadesigning.com/daduserfiles/files/silenoron.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fafeforitomaxokaf.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1ad08e08---667160294.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/20568433452.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/452abc44c1bef5304143a3714977b3d2/zixodolefozesivade.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/q55tiaj5s0v7iu0s8h7s9s0h8h/sixipe.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/67800809186.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210607091311.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/95654785035.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/dokageg.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/ravuruwudemofus.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/vitixen.pdfIn PDF document text
    • http://toonesk.com/upload/67959080478.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f08d5e5cd---sikodola.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/womifivarisemaruvotutufed.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/44918925494.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/xevenuponosubap.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/62827889088.pdfIn PDF document text
    • https://steammining.com/userfiles/file/35966366866.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f9be2751---sefisor.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/86662739087.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/modagobiboxulozepikajoze.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071db8740587---levigezorukupevurekubi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/37905223369.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_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 18636 bytes
SHA-256: 2829dbdc3b1202ad20da5535278829e82b3adf749722d5bb3aac39faf452bacd
font_02_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 10548 bytes
SHA-256: 56e761d3aa6f0ec68d3609a0a2041495a470d8dbb08465b3befab29e6d38ab01