Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e83a7ff5e1b57e8…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 06:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33a2d0a76d61d079619fcbd7c724e206 SHA-1: e816a9c966d8f762e09bd21b65a8e753a6319ab1 SHA-256: 9e83a7ff5e1b57e82349ee696a41dbc6440931ab30f1f7376680dc0faa812608
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=the+cycle+of+disaster+consists+of+the+following+components PDF link annotation
    • https://milorem-service.ru/userfiles/file/36021355068.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/23506007382.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/82428086724.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/45746006793.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/39918176289.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/62795906384.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210921_8136022EEC42978C.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/xetexipodalikujesubapizij.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/18388290471.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/lunaw.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zojoninopudugosaxetarilo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109071850278123.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/62994785327.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/89960444708.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/matarufavo.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/jikezulililanebilabega.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/34570428597.pdfIn PDF document text
    • http://hflchw.com/upload/file/fafatilawetuke.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///pafuvudiv.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/25f0c73e0f97cad173b5eebcd74560e0/55800716527.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ef46f3ea---50002347479.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/7ac4a6d23a888ff7a901dc40ca51c815/bomuwolesezatopawalewuf.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/73087529367.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/93938088386.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/90525a8205b6f9a4051b4c11f569fe00/20279897928.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/gediluvifiwadutimorik.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 11228 bytes
SHA-256: 845224973fdc347539e6fb7df2f123d0dba48fd14e940b07426b861615afe4b9
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1