Malicious PDF — malware analysis report

Static analysis result for SHA-256 b517934cf27db16f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c789c79c8f703c300eac6370aefc4e7 SHA-1: 4b4d5391152d1c5265920674971f26571a175cc1 SHA-256: b517934cf27db16f358db06174b94085f919cc521fadf02a0421e2315af7bf66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to websites that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple links on compromised CMS uploads suggests a tactic to evade detection and leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/puvojiwaxexozumegakox.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f4490877---2835328249.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/ziteforexipazakipubo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/009ca0e789d6654118a34ba4802c4395/kiwuropegimuga.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92e01a0bca---13304588871.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210830013643.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e981bc2946---51087357028.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b36ba2974---sopimejulabuvilewabogunop.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73fbnpopb2knf03qspq69bjmk0/kutowazak.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f916b81b85---81748186716.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sakopu.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/kikinituwivejepid.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/q38lpi7slvsv0oudodorjae836/97627168387.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/boxewafajukalapidode.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982847b011f---somukupiwuxunabujokesi.pdfIn PDF document text
    • https://birotex.rs/images/files/2415438850.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/zarugosajukazajewafowas.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5513a0739b23d05758a5d2a69af8a122/95321069960.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c581e45dce7---76006709215.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/86343159712.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/lavasezoxukodamiv.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8a64445cb---gexabogogejudon.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160757e29cac13---fewipigobazo.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/govapafume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=istanbul+tourist+attractions+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_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10672 bytes
SHA-256: 266f8d5c541dbf03f1f4cd2e5276c6413e47209e68f29677b38f4e5f6195700c
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 18292 bytes
SHA-256: 91788da74d91b261165316bea2eca5e1176b14b405da0beb6131c4857ae08b84
font_02_sfnt_off000131ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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