Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb6ae8424f52ede…

MALICIOUS

PDF

82.5 KB Created: 2021-10-10 02:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d61f1a1268f13380e4ae1326e0be8428 SHA-1: d20d3a2b0b076c878cb9ddbf6bd76ea1f73d6766 SHA-256: 6cb6ae8424f52ede798accf3f69d50b4ebfe01ed4ea50edd3f4e0744a4c55a54
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://unityproductions.com/upload/files/gugirux.pdf In PDF document text
    • https://vzglavniki.net/data/file/19368112205.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/86249266484.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/gidadi.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616024517a280---23629630050.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/xiporafosotetewaditepawe.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/razoxifojanuka.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/lifawapirivoribevawa.pdfIn PDF document text
    • https://novitas.ro/files/71299116786.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e203ed5a95---78385366977.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/92347944509.pdfIn PDF document text
    • http://airzo.net/userData/board/file/17124981354.pdfIn PDF document text
    • https://faceless.me/userfiles/files/9124207978.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/bojuputefusoxal.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/disolizogejas.pdfIn PDF document text
    • http://lgassociates.in/uploads/ludalawesixunekifivik.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-14-11-24-16-21.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/junebugofob.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/35137590127.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614966ec8b0cf---kewetewuzosubokoju.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/45712561700.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/615eb3f1cc3a0.pdfIn PDF document text
    • http://horvathortho.hu/tmp/sabewojuxomevap.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d898711d40---didewuxuxitam.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/39047644002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+unlock+an+old+iphone+when+you+forgot+the+passwordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 17392 bytes
SHA-256: 888c926970a148b489716feb8c73b719c1703ce58f8ca919a6e40dd05f489cf4
font_01_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 11284 bytes
SHA-256: 872ddd570a6660b38fe73587748ee8ec6f539abf9870e87c894a2e3998deb04b

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