Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf8cc8a1c46accc…

MALICIOUS

PDF

59.9 KB Created: 2021-06-18 10:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9edcb66697b1445261f1b1e158dc21bf SHA-1: abea3c6227a5813896af1df7d0c5879a5752bd0a SHA-256: 3bf8cc8a1c46accce5eedabfb61ecc5b81f2897447e15358120ddf9bf4faeede
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, many of which host other PDF files. The document body, though heavily obfuscated, appears to be a lure for downloading media content, likely to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10d2b0ecb8ec8959185eaa8d78f8888e/jonanegogoji.pdf In PDF document text
    • http://rustproofingottawa.com/userfiles/file/42132424211.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/90741618785.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bbd3588f---gojolovutenaponetus.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/32792267374.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2452996d09d6e0d154c0cc9b42122b01/24413954723.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ba871a2ed3a---4246895639.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/xuzonikub.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/17d5f1b38f0f83dfc34b5b86eb798fc0/talipiv.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6e7696635358129284902a6030794851/gefuju.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/71038182878.pdfIn PDF document text
    • https://tepihtrava.rs//files/rimuxozugiruzexidu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608753153528a---gofuj.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/34d23b460a8c060b0dc701fd6bc5148a/potalasuk.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/0tb3dcfitg8ja1h1e395o7nvl0/jojaribujak.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bcfdf3795---mebivibibumup.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ff0c3f42cd9c0e744a2f53d91a2f1b02/41890720916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sword+art+online+season+4+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 5100 bytes
SHA-256: 007a7d89d681bf5196dab39ec9e68c31d0b396cf5270a5e8f66a1c9a1c36a79f

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