Malicious PDF — malware analysis report

Static analysis result for SHA-256 846c9581e7578f23…

MALICIOUS

PDF

83.9 KB Created: 2021-08-18 06:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73d97fe8d9c25d6e4d343cec1aa8cbe9 SHA-1: 3f56c3adb71fb2d76ee611b71c8deab2a995bef0 SHA-256: 846c9581e7578f23ba9e16251e4a5f310143cdf7050cd89e698454ac6a35522c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or exploitation, while the link farm serves as a lure to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=ejemplos+de+oraciones+con+modificador+directo+e+indirecto+y+aposicion PDF link annotation
    • http://lungshingcentre.com/userfiles/57543637694.pdfIn PDF document text
    • http://gr-chem.com/upload/files/nulojoguvixubimofezobidu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66c372c99---fitabow.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd1d9b92cc---xelekafevi.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/f9kfm5ej6vemq8tes0erap3kms/tomilojo.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/52949796110.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/83912467171.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b3b2455911634e20171b77a6eaede63c/53648939030.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/78988262286.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/17754806832.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbe9e1492---bezasulejodewofeb.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606db06522a24---gabukafogulemimego.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/26997427516.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/95023429881.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/5283946132.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/10029565110.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807fc79f74---72550010741.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/91260710959d768603dbac626ba617ce/79320923614.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a452d986ff2d4faf6c4e678efe1b428e/90211897261.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/76128698026.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/46941357151.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e06049516---94910455786.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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 17968 bytes
SHA-256: e9e87415da77ee9427312a64dfbb6391ca6e31ab7a7aa2749b9d2d69cda1bb3d
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 11008 bytes
SHA-256: cac687ffe131d33a41198cdbf02376fef29a9b506c07cf4f715d24033372708a
font_02_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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