Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e81101f381a0fe…

MALICIOUS

PDF

66.8 KB Created: 2021-07-05 11:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0069e74357e3601c4c127320e5623264 SHA-1: b89d512a6761efa5c3395586bf2033d49439e795 SHA-256: 85e81101f381a0febaa518b19c7f7aceee28a9ca147c15bb32dacaca6bf69410
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically flagging it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8399

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b321df620---pafemejadakubuduk.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b934b2936e9---watokixiverizukig.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/legujatewep.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/ketesavasaz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbea805e9---56036251453.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/pujivogolubisunanovizume.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/61945060932.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7n2b3hb5cs5tprfv3arvf57ho6/furanuduxetu.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/62457851878.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051003560673499.pdfIn PDF document text
    • http://carszana.com/image/upload/File/kobaletumogawedipizip.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e424df47559339afec34d6f4dfd3931a/53583090289.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/961a0946effb9b612d4302d5417cd748/xonofibotawivoxijufija.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/47578252592.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608067f510e25---kereresobazobetox.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/dapitaxefotegupoku.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rpb9iu8gc11um6usobpg1emhv6/doxozuxewofuvogavidaloto.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/poxinawutarixefozujifed.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb4ba33e05---romebosukuka.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607225e5cd6b5---babaviwimimi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080271aaeebb---36833804443.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gofemakimalibigekud.pdfIn PDF document text
    • https://afayl.com/userfiles/file/29089935012.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/55130674154.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9f9b414543db7a292cf3ddd35b5994ab/56615780212.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/48337fc60bef9b21b9c652eb61ad30ea/figejulo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51648b6b17---lurivuwobujekuzojeral.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=is+h3po4+ionic+or+covalentPDF 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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 10740 bytes
SHA-256: 55ae79b1307aeb950929ce2c0c32ad7304bbb61b0505efcb3b4843b6c0dc14ab