Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f10b01436b8be34…

MALICIOUS

PDF

58.1 KB Created: 2021-09-13 07:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0363f9e00a5f558787a36f452eba8d0d SHA-1: fe430d7aada6f018cb56f08ed74755fff3181408 SHA-256: 1f10b01436b8be34d8c65d8254f1ba89b1bea32a40a04367bd321b235ddf5351
154 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. These links likely lead to further malicious content or phishing pages, suggesting an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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://krisoc.ru/uplcv?utm_term=drsabcd+acronym+first+aid
    • https://sukaunited4d.vip/contents/files/48792054940.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/27414d5d2292cf24f5e947f53b4df62f/vilarofag.pdf
    • http://dyccpharma.com/upload/files/wasanexozuwosodexarab.pdf
    • https://ultralloy.net/upload/files/rerezojexilafibaru.pdf
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dalaxurixamumegibunarapez.pdf
    • http://parcroyale.hk/userfiles/nexeja.pdf
    • http://aalzkj.love-mrt.com/upload/files/getegosopolebadipedupabu.pdf
    • http://kovovyroba-nosniky.cz/UserFiles/File/88365112981.pdf
    • https://stichtingech.org/ckfinder/userfiles/files/rusujatemimejime.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/purav.pdf
    • https://ukmalayalamnews.com/userfiles/file/tuwojilef.pdf
    • https://kimcert.org/E/file/tutasisalurifebekid.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87724e438---vubufufinuzixavumekifoju.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/89947491235.pdf
    • https://togelunited4d.com/contents/files/76556848787.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad4508a16---7789467299.pdf
    • http://resortvillairene.it/userfiles/files/mepagoda.pdf
    • http://japhina.com/upload/file/zejikiburulawamipusilo.pdf
    • http://queenart.kr/userData/board/file/fupebosaxijoxobozuwu.pdf
    • http://dvif.fr/userfiles/file/xumiputufoxaxoburifiwoxaz.pdf
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/22050645082.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379dec38b24---tipezugigaluneleguva.pdf
    • http://antichigelsi.it/userfiles/files/mototavuwe.pdf

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