Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94452ab14345b52…

MALICIOUS

PDF

74.8 KB Created: 2021-08-24 13:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 360e04cb842b215917bf4ac0fcaeba87 SHA-1: e6e35605a69dd6515983faa072f4f69177fbb059 SHA-256: a94452ab14345b525eaccc80beba5c12c312c33b5417a9058b4a91f373e554e4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9211

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 https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/920593eff3e82f38b7a10876e2d77858/kivudifanob.pdf In PDF document text
    • http://ankurgroups.com/userfiles/file/43719491312.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/94933818712.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/zurudoxameruselukofuta.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102caa62ad0c---87737863051.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/sojojinitaxetul.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210516113731.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c38fcfbd615---32051177151.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/8fdb3e807bd3a55445b5647a48f86702/jabolig.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pijidusuzilawoloruna.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/43616eb505014f8eb3c69305a517290e/fapewixikidujujubumebu.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/74133018367.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/uk542491rlhabl1mtovfltngau/31354674274.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/48759133290.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/fad5gh38s3l948j5k88qqfjdu4/luvuxabegipenebibe.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/96369679748.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f188243148f---32665155486.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dezasizukusubifumonon.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
    • http://wych123.com/upload/files/nafuwotudapovibalozek.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/51392665946.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a3401f45fd1---nabukezujufexapi.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/59588654371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=worksheets+for+organic+chemistry+answersPDF link annotation

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