Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef57778cd0a73cb7…

MALICIOUS

PDF

94.7 KB Created: 2021-08-12 21:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e06557c99ada4ada6f1602e7c153a57a SHA-1: 0e07e71a5954bde90ff6b7f3dabf6085b6a474ee SHA-256: ef57778cd0a73cb7975df0e1dbc3b2e7065f19a49b35e0d864724058d6c46b52
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a malicious intent to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://infrive.ru/uplcv?utm_term=dig+dug+2+unblocked PDF link annotation
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6759917721a16b2f0a4dac03c3e9f141/budubex.pdfIn PDF document text
    • https://pellevah.com/upload/files/rurulizaz.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1e2e1fce0b1f7a29cb506706bcc79769/nilugedagupalaxomixunasun.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd62dea6aec---51870784101.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45635931022.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/9082634308.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/fevisofogemexituxudom.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a75357f9---xupafisoxega.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161008efae7f78---75049758250.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gokurep.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/xevag.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/79536652241.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/69618335600.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/kiraza.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/25465160235.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/48004810719.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1942b30d84e86ed83e5f5507eda44e59/68760956786.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819525b6f48---69678819722.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1f42df65---mupoxitugomun.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/egbou1omha35tdcbbpk1mgq024/nudiz.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2n7cidqgdkb59of7eu902dg853/19910346615.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f3c12c25cadc9788e0da53124b4b5697/24292629300.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac6461742---94200186925.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_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 19992 bytes
SHA-256: da3361228bdeadd7b31ca3ec258f917086c0c0fc8cd60e0bb3165dbfd84ab926
font_01_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15529 10468 bytes
SHA-256: 3e9e5da753258170f8fa54cacda7a56c6daaecd7513b3574f89d76b2a1e98e54

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