Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ea97ca4a7e68b6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 06:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac4e4e662d8e9bee7a19462b7597c3b9 SHA-1: a8e88c69c9a36e46098abd446fe06ade9a8b7abe SHA-256: 20ea97ca4a7e68b62ea20af68caa96b0003bf8dcfc3bc79e7908b4ec917eeb47
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains flagged as compromised or disposable. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to serve as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7569

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 http://cdn.eagle.mn/uploads/userfiles/files/41672073896.pdf In PDF document text
    • http://opsir.eu/files/file/21284021666.pdfIn PDF document text
    • http://receptlap.hu/files/zokigagogisexebepotumazi.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210905_105635_126.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3a9fca00d33443fe3e18062597383140/kijomumefafa.pdfIn PDF document text
    • https://jck.ro/userfiles/file/duvaf.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/buxesikunumumorodunit.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/mirewov.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/tazixowam.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/10447965383.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/fedepu.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39566214796.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/zisipapipuwuwapobej.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/zajazogik.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1u4sanq6ivrv050vgl5i0h91am/woxefu.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/98940592821.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/58907585336.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6690562d---faripazagoviniboxuvojopu.pdfIn PDF document text
    • http://infosierra.es/images/editor/lujotemixopanofujakorux.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/8537581721.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hqibede9isb7cttf7puuavk9o2/guxodusaruru.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/1c3lo4ahc3utdlfupt74tij1r3/18919879231.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/37139836662.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/samofekuzikusezif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+file+manager+for+android+phonesPDF 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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 17656 bytes
SHA-256: 5b34c64228338696a0e62ce99a2d47f370b64fd32838ba5969fa75127da5c40b

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