Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec94cc74e8ad2b01…

MALICIOUS

PDF

84.1 KB Created: 2021-10-04 18:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ad82ce43a1ee6f5057507c4c21ee807d SHA-1: c88c884caec2eb0b903282eca2331b5db2c4d12f SHA-256: ec94cc74e8ad2b016cbe1fe37feeb33097d83161f8f37a31f3b9562a2eccee0a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or exploit kits. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=find+the+nth+term+of+this+quadratic+sequence+2+8+18+32+50 PDF link annotation
    • http://rjt1.org/upload/files/15092567904.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/jidamax.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/kolekukonuviposu.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/57818303509.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/jixubenonoro.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/21591582740.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/xusojizugeropedax.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134feef787a1---tujeragawosixedu.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631329552_1.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/difotonamal.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161434e0cdfa5e---tutenasanevumujeguvosaw.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414dbd5e858---soxobaj.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/94368778330.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152b1174d3de---27384870612.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/29857773557.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/palerirape.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/51459289936.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/35607981888.pdfIn PDF document text
    • http://eventechsite.com/files/files/ruribubarupavigekavadaj.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/zuvebaduwixo.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20211003_BE31630D065E623C.pdfIn PDF document text
    • https://servauto.fr/img/user/file/52417247208.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/59409427301.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/vebamobo.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/newaku.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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 11728 bytes
SHA-256: c94478d191a52f047884e107aa35883cbe88e444783475cc393cf99be3eb7022
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 20580 bytes
SHA-256: 0e2a403ac1f0a8f68fe0e941d30d44666dfa394c0577161fe46af0f856869598

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