Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8024ed61a8ab83…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 06:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76026484c9ea1ffac72b453c054e6b89 SHA-1: e56ebee8228d9d4430178766240bd587a6e35598 SHA-256: 2d8024ed61a8ab838e1e3b1b46bee7596b547372c02948798c1b33b600d27056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the general structure of the PDF point towards a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://synerhu.ru/uplcv?utm_term=wings+of+fire+pdf+free+download PDF link annotation
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/fe7b9a0c6c15fd108ad314f43e9ee7ba/ruwuzu.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/71853664937.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/75852055623.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/welavesukagewuzotutolavo.pdfIn PDF document text
    • http://drironcat.com/images/file/gevaxesazo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b677a109ce286d7a04cd0011b133df3e/4127948545.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/16831574484.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/57691290748.pdfIn PDF document text
    • http://delve-cr.com/uploads/batorukufafugaxal.pdfIn PDF document text
    • http://armanetti.com/images/ragel.pdfIn PDF document text
    • https://tadimtursu.com/image/files/56342321349.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161185ed45c41b---67149427698.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf1f2314fb---fabafedupunetegukoxar.pdfIn PDF document text
    • http://championsview.net/userimages/dimefevizowedoxokizid.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/08079a4c2a97c50f19f464cb31a31c75/83863711577.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/feweduw.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609422c8e27b6---22818625447.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2f0ea6aed4a6482697341f48ec906e7d/fepuxojikenoguxivakapim.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051622490734.pdfIn PDF document text
    • https://actorconseil.com/files/file/91976144398.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/vutipunovesajejapukevur.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/malojidetira.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/jupiwojesukikewilesam.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff31993a911---mesija.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/flt87jspblftio4nti2lusnlpv/46356029284.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3
font_01_sfnt_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 16680 bytes
SHA-256: 49c03cd6251356173e50c00452638abb49577efd9eff1fd8f1be09e748573bb7
font_03_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 10656 bytes
SHA-256: 90d1770f9477e7fb6b78507699e6da0a9a495ab763bc1123acb3b8344d186f5c

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