Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cf893fe879ab4b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 01:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5d714b0b0059c1be49409cce62a8940 SHA-1: 396abe01e685c1ea4cc504baec42de82c955b8c2 SHA-256: 84cf893fe879ab4ba41e71368e2b0b950162f065c5a4f5126cbea1760e02302e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely intent to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=jaap+sahib+paath+pdf PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c81f4847b---gevirikisepurivevo.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/12753275446.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2f9cf09b---tegezimabid.pdfIn PDF document text
    • http://cmtsport.com/pliki/banivetanevibebesoka.pdfIn PDF document text
    • http://askort.pl/Upload/file/jorinafigumiw.pdfIn PDF document text
    • http://wernitznigg.at/files/43002597134.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/67745020004.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/25573579593.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/59af92507f2a3b0819dfcf63bfc442fe/57578786415.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81549444727.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hkg6pg9lr9jqkq061sie7klqv6/42433772803.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/62207932856.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429222818395320.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5d66b965eaffadf019368e7c038e2498/11718430944.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083d75767f1e---32862049978.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160899fd602087---zanepupojumu.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/joliwepozaragutewuzan.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/92967163959.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/bazanesemuru.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/79760394319.pdfIn PDF document text
    • https://12shio1.com/contents//files/64733089936.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/g7oqp1v9qir598dqpncq2lms5e/safezodudakomaxidedixi.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_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 20224 bytes
SHA-256: 77fb7ccf9f667db2d4266b3dd5c762488794d2108197baa6a6d11b61c2a6a61a
font_02_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 10224 bytes
SHA-256: 353b85cbec208f4b710c83a178f62d7e0c7a589eef9594f5d83fea4bbb8ba8ca

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