Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcd3557340e46d9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 08:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5e3ac21211c765fa46f0b365125916b SHA-1: db18fcf073ee6ebcfbcc2430021baad4b3cd6af4 SHA-256: ebcd3557340e46d9984c07e1b95eeaae4d916c11018642523a6e7b808a5078f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nacyc.jp/Upload/file/88789028030.pdf In PDF document text
    • http://archifolder.com/userfiles/files/8199326438.pdfIn PDF document text
    • http://homeopathyhk.com/files/potaxekexazofilagev.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/97429781484.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/foninakesabenamuwe.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/zakis.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/9336344373.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/7341866824.pdfIn PDF document text
    • https://profm.hu/files/file/97602808482.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/99032343089.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nefugonabupabararefilile.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/lazuwodutaburujexejutu.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/zalezenavuwuvegomarig.pdfIn PDF document text
    • http://epicridesnepal.com/files/kerosukepope.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b75f9e8aac---basuvoperixiwutowoxijol.pdfIn PDF document text
    • http://cpviettin.com/upload/files/kufuxoporanotosanofule.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/18974986308.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/fadafifexaronajoxaguxaz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e92e425716e2e5943a44dcaa7db7a53e/rasusejevokawudadepi.pdfIn PDF document text
    • https://diagoldjewels.com/userfiles/file/815156792.pdfIn PDF document text
    • http://szcftz.com/upload/xavufimesenolabutubebubu.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/lamowa.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/33d5eeb1fb7c2eff7a3dbc4af6b4e7bf/32988257086.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/bowojisesoveborataledar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=where+to+stream+promising+young+woman+freePDF 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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 11052 bytes
SHA-256: d24cc648d95dbe14a8a1d8ac8ed8ef26f18b8deddcd36c56afad548c12990800
font_01_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 17888 bytes
SHA-256: 056b3b3ddd4356705aab64bd2b5a395f14275f762f5e98740f3b9ec4289018ff
font_02_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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