Malicious PDF — malware analysis report

Static analysis result for SHA-256 f862b829fa6d1434…

MALICIOUS

PDF

148.1 KB Created: 2021-08-02 14:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 615b13a43114d09f882980e7a62690fc SHA-1: ceeca6147f9a5e76ec95fccf8b0f6a6d6b38a6cc SHA-256: f862b829fa6d143490722bce89d6cac0c1b65981093f7623f0d22ea93c19f564
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads and disposable domains. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious sites. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

Heuristics 6

  • 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.
  • 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://www.masozilina.sk/ckfinder/userfiles/files/kuzexumobopanisesomi.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3osndn0k87uv2nn5oq21nn4c43/34201404371.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/94571634584.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a60580c458d---92457551746.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160be42a8e944d---jowunir.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd20830820---50437121291.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c0dbbfd2---94708046259.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ae1c85791---67666786221.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf8688bb1---tikoro.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/85794220159.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/37310814968.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/moteje.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/gugemolinufozufivezizoge.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/795039fdabf861f5aa787f97dd16d9e5/4853059348.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/pexevugituwexedowadi.pdfIn PDF document text
    • http://domainecomps.com/documents/files/kisuvuzu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046cc317c23---sadigiraxov.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2df76e83607fc114c1832f8cbf4e2e9f/vamavasi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae61523d6---bevefuxadulawejukobajuk.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/oqg65ftgct71v5m8icie56qr8m/99100536627.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845c32d3ac9---fapomigunama.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d429b14de063d6fbb57cdb62eca3d5e6/96227624677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=medidas+de+la+cancha+y+balon+de+baloncestoPDF 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_off0001dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD56 20292 bytes
SHA-256: 11811f0490f5ef785b6e5d07a1e68e06a2d3520b52eaba4d9df8ce45e6973147
font_01_sfnt_off00020f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22736 10616 bytes
SHA-256: 1d3bb95a0df23e35962a35ac03d8e58d5cdf74de5af0a1d8d03aecc6ec278da0

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