Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ce0962a9e9c1f9…

MALICIOUS

PDF

102.2 KB Created: 2021-07-02 01:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a77d49e217ff6bd9c39015add707f66 SHA-1: 1c5c470bec8088426a65b3b1d1dd145738497254 SHA-256: 92ce0962a9e9c1f9645ca5aa0a1c7eba01a538442bc13da47306d8cc19a256fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://ketchas.ru/uplcv?utm_term=medium+feed+in+braids+to+the+back PDF link annotation
    • https://impresa-valli.it/file/potepubexajunanapebidojud.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecea5215d---golerogebejedow.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/dozosipunufebipag.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/43544984062.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qdftr9qj5tb2d2i7rhmv4vblj2/69427605667.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/3b8t8jqfkbpu1296q66t01bq1s/81000229054.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/86285978250.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b5da66df---56072518072.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/84761751835.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qeshre61037e299lj4cp6tviov/nifomuvevanu.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/58535811932.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/8trd2ai11hhmfelav9g057e2r7/13395579309.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/tprt4pail12j8cotskpdkvsc15/15476040528.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a1beb542fa79a118bfd96d4c9323335d/46188785316.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/41975069322.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/gilurisibudupemilunefu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bgqv8g0bptg3t6m70fbn58720v/baripevotapupurov.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210620_151814.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/sixajegowaja.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/gixazexajim.pdfIn PDF document text
    • http://renovator.cz/files/file/88669631194.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c46272d46c---vulikinemud.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/55033069858.pdfIn PDF document text
    • http://abpaluso.com/upload/file/8686118282.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/nadugonexuvutaridixifam.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/nasosutejaxezok.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/utdo8nf2hhrgo6v3hmqn1oi9e3/4836832102.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 17308 bytes
SHA-256: 2659b44ba131800f42c7be6ddc88d1b54649d14f90f996da111399fdcb19cc6f
font_01_sfnt_off000143cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CB 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00015941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17158 11020 bytes
SHA-256: 97b8fe9dce3404b527a8eaae4d2400980cd4728138952884adfc50d56c7af218

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