Malicious PDF — malware analysis report

Static analysis result for SHA-256 b988817954e4ddcc…

MALICIOUS

PDF

95.9 KB Created: 2021-09-09 04:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6d180409bcb9573b189ee5999059b64 SHA-1: 2f2dc96df79282fed22e8017eccb7b48c22be608 SHA-256: b988817954e4ddcc6c5219818f905d15b0b591e9b938eeebbe5c98ebd9526bcc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further malicious actions, while the link farm structure suggests an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://artio.pl/files/files/noneg.pdf In PDF document text
    • http://yurisolomko.com/userfiles/file/58968696989.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a14e617a5---41571030321.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bulakufonuzezinukavop.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/loxetagaveromedude.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/ginipakubamutatetawu.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/watas.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/35762633443.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/gukopamozapabomedu.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/57097988129.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132030e07d7f---jezosijupu.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/mawobum.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/11778058128.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/disaxivukipobotefum.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/seniberapukafavez.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/vufog.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/42446019980.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/60871444069.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/37636546891.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/94561675705.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/11330897674.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/dewibulevevad.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/23262295706.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f546e1e9---lujadagisukamekiw.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/52118191692.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/lixerosemunesuwexifepi.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/paruzis.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210908045352614185wkoy3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=maggie+nelson+the+argonauts+pdfPDF 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_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 10872 bytes
SHA-256: dbb89678f80acf267c8d02435dc0237eccb3041bf1c444d01bb26c631ad79ef1
font_01_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 19060 bytes
SHA-256: 54dd2c86ed66f43c76a9c2f4fab4c2ad49ddd455d399db0d0c41a224a08cad7a
font_02_sfnt_off0001593b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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