Malicious PDF — malware analysis report

Static analysis result for SHA-256 876ecd0f4b4c29ca…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 23:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8b2647be85250406c19f455b74ebe37 SHA-1: 79b60e0dea6cdf7b0e14b5977a2ac707e51179f8 SHA-256: 876ecd0f4b4c29cafcc19eb6a726b17ebbf6de076a960989d244a66cbd671cbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an effort to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://sluchatka-shop.cz/files/upload/files/bisazod.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/495cbae3f8e0f24f911e20d1973cd06e/kovesomusonugut.pdfIn PDF document text
    • https://promise-land.com/upload/file/97692406718.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/fewup.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/ruxemomedafawuz.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/74994897434.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/193986831360cfe4e804aea.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vo78nfgvjrt7uc33q7badhvijl/23813846870.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/16972646135.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160834b22725b4---wazulosi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756a6353cb6---13412219498.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b237677cc37---93565150840.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/01db6c60845748eea3ef34e0bd89f49e/rogawud.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wozirarevopefidelovaraled.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/290021103827.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/seroradakanopulitafumam.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/tnjl8qlvpkgvpns47tvahm1ntc/18833787862.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3e2ee5f7a966b1d9955feb5dda81820d/dijuxezozasaf.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d2da5b4227082b82e7b421854c629cc9/53362739457.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef5ef1d9f---84122481297.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f2ee7b0035efcc33b8c9270685786ee0/sigeduwotun.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0453e797b142b20e4541d9cdea1f1442/84514635711.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aac73b245---57377827882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+meant+by+beyondPDF 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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 10612 bytes
SHA-256: 1b8da56c2b0c2328ded606149be060fba24e99954636366ae8ccb90e285cd182
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 22616 bytes
SHA-256: 5202fe6a9c1e89c0e9287437502f64fcb556dd38d4ff4e13e0f7c98aa72b7fd0
font_02_sfnt_off0001376d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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