Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcaec037a3f8c90…

MALICIOUS

PDF

90.0 KB Created: 2021-09-15 22:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5eb5d91a303dff07df03050ba6e6cb1c SHA-1: 18e6692f08ee3d9063a14a3dbccc248affc44135 SHA-256: 5bcaec037a3f8c9067681f9cb0d8d46ab614b2742a2c126799e2b75bf0ac380f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF's structure and embedded content indicate it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://guitarenko.fr/img/files/99786351324.pdf In PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/xixobiropoxasijobok.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/koxegovisukazodusulebi.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/ritugaxesomonirerusemajoz.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16130733d32f4e---51160471501.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67762dce5---40054182045.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/41222764956.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/46846131588.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/zobutelinovamuzad.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d7a85cf7b62ea3f64fe228aab45706a/69122059744.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/xabale.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161315c2a78d2c---saduwisadipa.pdfIn PDF document text
    • https://goodline.by/userfiles/file/32003245984.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161361d94c570d---fivomenol.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d0cf78083---64788338598.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jamunovizubavidufu.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/78521861578.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jatib.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/bazevuderepiba.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/bopunev.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/78307734060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=strength+of+materials+problems+and+solutions+pytel+and+singerPDF 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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 19204 bytes
SHA-256: d57e52db62923a3391b260230fb86c8af4a3f210ff27d6446be7c2b31e24f845
font_01_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 11372 bytes
SHA-256: 7d4be9d7b2027d3e95f3661d171eccecc74884c4314229b5d8d12ad44c42565e
font_02_sfnt_off0001428a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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