Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0d4de667b1a167…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 07:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1764d254e45d1adadd051c9d2f4d01d SHA-1: e2c75f03e3f2bb50268211626bb1e0760d9c07e2 SHA-256: 9a0d4de667b1a167bc4880ef26080c3f4eb16eec904cedc4b59fa8e517927bc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content, contributing to the overall phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • 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://ninda.vn/userfiles/files/64253118302.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134796fae77c---20064091298.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/47463272206.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88001524918.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/gipanapixogakozinivowa.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71110527603.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/69791751877.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/77126592831.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/95441238034.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/io05b9p5jjg52sc75j0ou2m4o9/90678807965.pdfIn PDF document text
    • http://gzwep.com/img/file/202191810758.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/kijena.pdfIn PDF document text
    • http://boldogelet.hu/media/42105594021.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/rusuvokozewurugerijema.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/54457666605.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/tapigafatofuf.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/19700053514.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/xilab.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/segojoni.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/semipo.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/6455710075.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/2361818019.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/91643517931.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8cf9f1c6f---72623973205.pdfIn PDF document text
    • http://grupophi.es/uploads/files/33779388244.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/suvem.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/62278040345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=advanced+strategic+management+book+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_off0000bfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 11196 bytes
SHA-256: 9329ada13a109f9b5f6b49c495d345c782ee263e8c4eaa8f76c4ef492cfdc723
font_02_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 17040 bytes
SHA-256: 768fe6b4fc955e63f58979e8d3b6e5e3b6fbf407805e1233a0ec92ca8047efbd

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