Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b799386d6dd7ef…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 17:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2521caaf4331da6929c70cd50c242cae SHA-1: 1dffd050423797ee4d6cad175a0b08f31ba89966 SHA-256: e0b799386d6dd7ef0f685f708eef872af5ba18524be8bebf110a821750e279e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to other sites. Several URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bippex.com/filespath/files/20210906204833.pdf In PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/kolebele.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/80f2217eca4107c36f0c34180e513621/fuzegubisazaxesewuti.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/mabiwijolanujapisefobemem.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/zuvewiteguradalipedeleka.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/bovixu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614579d35760d---sivusajinanozadotatav.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/54790866843.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/guninijomasiwisetug.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/famudope.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/wewiku.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/50230453413.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4b16b14e---repelobilevob.pdfIn PDF document text
    • http://retrofotr.cz/files/file/gegawesebuvisobip.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133904881b5d---zomegunusiwufoginoletu.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/wojimatawozodowiviw.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/toxik.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/68390741247.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/75993468489.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/52321596864.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/53264529237.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/lonasukesizu.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/21106999397.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/buwakomojituxowezivabomag.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130fb02a6227---dizofepo.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/matarobugudikiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=immanuel+wallerstein+pdfPDF 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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 10676 bytes
SHA-256: 6a357b80bc504fad0582c5ab65e3af568cfed9c187904f33a916530a3bb31d6f
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 17544 bytes
SHA-256: aa62e3f7b34e95948d16eb5fd10ac8f5ae781bb3458d49eb82f7b44657bf7584
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1