Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e940313317f4a3a…

MALICIOUS

PDF

91.1 KB Created: 2021-09-15 23:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50e23d6ccc3fee8a707788430b74268c SHA-1: 95acd9f82beebfe8cd2af9029ed5f8b62b1567cc SHA-256: 5e940313317f4a3a5c0bae8749c1dc6df584a214f1b323086fbf1c97087899c2
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be non-readable text, further indicating a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://guitarenko.fr/img/files/kuvegexijebapodi.pdf In PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/wutak.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5db3a5062db997872bafd2046f9f971b/52950901361.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ae2c148349e696105f5ca3882c1111b1/72577038388.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/viliniwujusud.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/sufibazagiw.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090123192573499.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/jolokitopofuvet.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210908_F84C921810A54913.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xekefivizaxexixu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c349aef9c0e20277523e88d9dcde8208/12419258904.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/xalalexorawugokapuwabixux.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/13263298548.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/gujivabenub.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/xibikuleloz.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/gibikunusifokolibi.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/denaguj.pdfIn PDF document text
    • https://steammining.com/userfiles/file/31112589925.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/52241846650.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219131197954.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109130811564910.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c260e13b---pixawe.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/75627303821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=all+apologies+acoustic+chordsPDF 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_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 10768 bytes
SHA-256: ee07874bdd7a950a4c0efcd84bf445d1c807baef532730dbe49641d84492356d
font_01_sfnt_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 18540 bytes
SHA-256: 53d99cf8868a605dbe965056b78e64db23400937c7967cfd3c1c484f7db6772d