Malicious PDF — malware analysis report

Static analysis result for SHA-256 9752a34be62f1839…

MALICIOUS

PDF

53.0 KB Created: 2021-09-19 04:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02191d7ae7dda80d5d79a5815149cb5b SHA-1: 17ae8bf2ee81d28bec38b099193f422e30ada515 SHA-256: 9752a34be62f1839c72142f1a6404eeeab913c28845cfff59ff03d82961a03cf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised WordPress sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5591

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://pistant.ru/uplcv?utm_term=bloons+tower+defense+flash PDF link annotation
    • https://krantiservice.com/ckfinder/userfiles/files/7373457474.pdfIn PDF document text
    • https://aedwea.com/upload/foto/favozuxozi.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/12323333236.pdfIn PDF document text
    • http://scro.ru/pic/file/sedasuxile.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/puxukuxilususemusox.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161386a434f866---bibepamezixiruno.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/piramesaxagaver.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/34627776436.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/veduv.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/pesukolowekizoriwiteniwu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1u6i71k4fu0nprp8n4rltas4pn/4884295570.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/nuxitide.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/zuwetodo.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/90883020975.pdfIn PDF document text
    • https://dptech.vn/uploads/files/24827050734.pdfIn PDF document text
    • http://bibikid.ru/upload/dudebidafa.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/baboxuzi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe16455ee---jegijasikixuj.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/darot.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210915142027.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/53122433445.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f2b83c02a4894418dce7370b62d7034d/10528684461.pdfIn PDF document text
    • http://hanauhrova.cz/files/59423021081.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba2360c66---90304094257.pdfIn PDF document text

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