Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eec6f5a4a69167…

MALICIOUS

PDF

79.4 KB Created: 2021-10-10 07:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 617dd899cdf59b6fc733abb2f4dde2c1 SHA-1: 76ee9b7b4d5ce7223721a1edad3b0f4d2bca947c SHA-256: 90eec6f5a4a69167cd759fec30d3a67d2a0baef702745de0f3aaf2f8f96dc072
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a browser extension installation lure. The document contains numerous links to external PDF files, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. While no scripts were directly extracted, the nature of the lure implies potential for JavaScript execution or exploitation to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://baovethanglongmb.com/upload/files/78734198780.pdf In PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_02_19_04_03_5657.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/waziralafotuvanikire.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161615c5a5e7f8---96470640644.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e1e2f71ee1---dusogulajox.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/94514357191.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/nupujarolizisad.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906105404.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/xerozibavaxo.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/repuv.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/gifuzana.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cea3b1b00---68019412782.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/xufiwasususe.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/78937426938.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tezowadokejozuze.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/60274005221.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/netaxuperelofuxofifi.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/lezusaboxogepagaze.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/xenagotinozazesusetub.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/73075225514.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/10362592803.pdfIn PDF document text
    • https://tessuno.com/upload/files/614d179b5515c.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/87602818114.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b21caea342---felal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=computer+course+books+pdf+free+downloadPDF 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_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 11140 bytes
SHA-256: cdff59a2986e20362cee8249b35f1a3d2e803f286430a35160c3dc18d8bd090e
font_02_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 16528 bytes
SHA-256: 963641ae357fcd1cc93aa623d185ca05fde0f0d8ed2235ca96ff24da5f8ee619

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