Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b354c48f2e51b01…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 08:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b229e5ec17b9724491b417a879948ef SHA-1: 76dbb11691ba9ddccca312a78175065c3953c2ad SHA-256: 7b354c48f2e51b01a498d6809d9a0260b91444bdc0794997fbf001585a2b8112
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external links, which are structured as a link farm, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=brazilian+portuguese+beginners+pdf PDF link annotation
    • http://www.ondebiz.com/userfiles/file/dadutulatoturunujiraposas.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/afac9d1a13a174201743d0126b826e5e/zetowojakupoju.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/relosi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/xotupofujidu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6038146a1aa6f10b1f611c4832fda283/96083017991.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/sanusaruxobosuzejabijub.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017cdd7d2e---wapigepurajubakufopinafo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7393c9fd03eb10036cf345875e323f38/fobikiwanobedidut.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4cb1c979---pagemidipub.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb69f18a4f8---99614979881.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ca0c2127---51541265052.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/11556dc6c0df6f04ccc488f980b794c8/pilujomebewemopobi.pdfIn PDF document text
    • https://vendax.ro/files/file/28299852636.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/83086835464.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/23107092408.pdfIn PDF document text
    • https://taperagi.com/contents/files/45360161927.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/9a630c47f7b7bf5592dfe023cfd8b49a/dukaxusiga.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/guzojelewu.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/49069392321.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/92877252025.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/37777829480.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/kopewalizob.pdfIn PDF document text
    • http://distributoram.com/files/file/jasuxigurarofebile.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 11024 bytes
SHA-256: c76a89474923c310ade21bf531d9c62620d96117376c493412ffc5bc581ccf6a
font_01_sfnt_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 17632 bytes
SHA-256: b82a55f5d40ef26f155c21e7933e5e461b07134302aa1c3ec7a592e626bf0680
font_02_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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