Malicious PDF — malware analysis report

Static analysis result for SHA-256 4987a7511476cf26…

MALICIOUS

PDF

96.5 KB Created: 2021-09-06 20:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8a0260f735a103f37f676f991a76a27 SHA-1: 6e6f1892b8ec7cc0aa9e39cf6ed149bfa25985ad SHA-256: 4987a7511476cf2689fddc57a67c820d6b44271ae4d089e38b5d188d992f67c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt at SEO manipulation or directing traffic to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://safeabortionnepal.com/userfiles/file/lojopasemebowelogotu.pdf In PDF document text
    • https://hashtag.school/userfiles/file/36034589863.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d7c94cd8---68810883471.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/mijugivepafefokoviwukofi.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/84972997105.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/topobu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2f964f7b95095c2423e7703c12442caf/8549746739.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/26817399908.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865d77e6fd6---dituku.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a656a5ce7fd---zobizugovoximexo.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23f80a0cf---tifamajovijiwodasibufi.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/tulamuxozesutesepekodak.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/zexomu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d27618ecf70---roboxel.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/9901391148.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3028270d71---zodakujako.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/908944c69c424c5caede47dbf5ee18d7/zunidizemimakap.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/35227992669.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b307e2355d2---pidof.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/popedusezapukuraxixa.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/56005713306.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/tozod.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/fajilo.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e19fddc2b---mijaxoledan.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lovak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+willpower+instinct+kelly+mcgonigal+pdf+free+downloadPDF 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_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 19148 bytes
SHA-256: 96c06a121f4e979dea248cbfffdbb1f4637e65df550e93d9066429ecaca596e0
font_01_sfnt_off00013faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C6 11324 bytes
SHA-256: 1dcd6815dc02af896852f91f22547f99aec32afdd552eec723a5d7af40a8471c

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