Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ce005644435074…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 02:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5ff5efc970ec837566befef5bfb3e37 SHA-1: a8647d4c831c39fb359d38f352186ed7ec71c23d SHA-256: 15ce005644435074b946a28206f08049c5687d0ce9eb4f1d5d4a53d2d8dab59c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=how+can+you+get+into+a+locked+iphone PDF link annotation
    • http://sushiloverca.com/uploads/files/89424588893.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/naxowuvese.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/pabonofobukusuxi.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/pegonugumobimizapik.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99497d544---vefomisadevulirixo.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/69900228742.pdfIn PDF document text
    • https://kapefashion.com/files/files/pameveranuganokorozo.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/37056895229.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29d76e76c94111c94af7ad5748895100/37195803802.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/kegiwebujipiliwigirefobex.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/nuzonorizatamujijawe.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/bajebikozugideke.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/dimulozupuxizaruberebe.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/89850626423.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/82294541901.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/80873022934.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b91c9ebcb---78064056220.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/95493125784.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/68488019897.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161355c97cf7e9---81761651518.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/fivadowog.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/5682137872.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161416f79684c8---fojugozofatumedufi.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/3108201387.pdfIn PDF document text
    • 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_off0000c643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC643 18068 bytes
SHA-256: d79daddc07c8f7442c55b7cacb663c09a87c7b22397f4d73dcaab2d3f703336d
font_01_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 10908 bytes
SHA-256: db9edf7433f472f48967987b5e3ceed9671cac9e263c19910f7e1964180a02cf
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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