Malicious PDF — malware analysis report

Static analysis result for SHA-256 d137dc406fd72206…

MALICIOUS

PDF

86.0 KB Created: 2021-10-05 16:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a5773c335216be4b168a5d15abd944c SHA-1: 8561c229d1469b05fa9a6a852f59784b26d48a2e SHA-256: d137dc406fd72206fd6d6e488e3a1871a19f0b7b2a63083ae6a653c2740d4df1
64 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to redirect users to malicious content or phishing sites. The heuristic firings indicate that the PDF is designed to host a large number of links, potentially for SEO poisoning or to distribute malware indirectly.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4503

Heuristics 4

  • 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 http://ginzaoakland.com/uploads/files/37008573293.pdf In PDF document text
    • http://asckhn.com/acskhn/userfiles/file/dosakinenafewejimug.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132676b73ea2---71328283798.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/16193919332.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/lalos.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20211004/file/48189581574.pdfIn PDF document text
    • http://grafitym.kz/files/file/85988432573.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/xiguseveduxinamud.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/6408368594.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615b969328bb7---wodovubowojupawopefolonu.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/49970953163.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/73750542727.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/60873595273.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/detunomodafisefiroj.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/6495710431.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/cee0e3964a99e5ed428638904df12895/3550343991.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/69830821848.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109281054267899.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/75917495655.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/doviwewekigeravupozomitop.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/lujipuloforosed.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lesebukukulojeb.pdfIn PDF document text
    • http://carbonelite.ru/file/70746818410.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/41892676581.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/58768079925.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/29495431027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tome+of+beasts+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 10236 bytes
SHA-256: db6ce631f040cc2dce05e3910eb2843a70cddc9761cd5ef2f1c70b96b159421b

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