Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46e53dfd6e547ab…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 08:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 574b0e849cb582370d14b1807b272e63 SHA-1: 5d1f33efe1a2fd09119ab065040977f21da8ff6a SHA-256: f46e53dfd6e547abf407ab700edf8a9a149564136fcb1ef91c5d39ea3eb7d21b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on what appear to be compromised WordPress sites. The presence of JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://antropolog.ru/userfiles/file/vonalujuzoraboro.pdf In PDF document text
    • https://skykharchono.mn/editor/files/bosetogox.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2c5eac55a4870986f6e9a72b2eb96386/8253491961.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/xiwolokew.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/75007514278.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/48552418359.pdfIn PDF document text
    • https://profm.hu/files/file/29363213692.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/77958461781.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/duperokimeda.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/kazusowe.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/vovokete.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xozodorexexenozojuwav.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/lufaremuzetarafokevavomos.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7555bce9---51684238952.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/55082306333.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/079238033e113ee028c8190a77149225/67892395075.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/3182116099.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4165157387.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/xanik.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/37838044609.pdfIn PDF document text
    • http://faradbox.pl/files/file/ronizilal.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/77337763602.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01f0c4319---49699761646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=abcd+2+full+movie+with+english+subtitlesPDF 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_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 11152 bytes
SHA-256: fe767f24458765b5153ea764e7a037a53c34aaa8f5474857bfa8da5b8b0d7f92
font_01_sfnt_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 17820 bytes
SHA-256: e9ca38c58c977218eb7051287eb4d4c16ea32bb20d058d97bbe13286d56a8785
font_02_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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