Malicious PDF — malware analysis report

Static analysis result for SHA-256 340e195ed94da6b4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 05:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4a38381cc38c69321dffc71ce88b964 SHA-1: 690e0ad05ec71e34db53028c709cc2745b830e8b SHA-256: 340e195ed94da6b4fac1485bc9243d0eb962230f577aa8c42e6d64fe4fa211a1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. The embedded JavaScript is likely responsible for executing the malicious actions or facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • 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 http://stlnsk.ru/uploads/file/65349037023.pdf In PDF document text
    • http://huzatfokozo.hu/editor_up/70905358960.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/xujapoginuwevegizo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c878966895a4cbd2a89df5dc50481b86/pobozafejuzilire.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/nizefigakelizoxadadosomoj.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/56214380821.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/nawutovil.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/75634941892.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/pakenenuwi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd483f409---xoluweza.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/567l442pb76h1q731iierckgkp/nokejesiwurubibukezi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358d21e0d11---58562771883.pdfIn PDF document text
    • https://buka.ru/sadm_files/28729420977.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/nosasuvuladoto.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/98471625192.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/79108361315.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/23072918697.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/29072113411.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/99243871274.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/72878228960.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/kulolagenawuwir.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/xotelorix.pdfIn PDF document text
    • https://areicon.com/images/file/wofufuradosubinojuxe.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/gogumubajewutoxiguna.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/96418308470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+apk+pc+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/lulixi.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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 18420 bytes
SHA-256: 427af2d68d15f2a6aed8c1c3a172361d90fd001a99a5e862eb6726753d19473a
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 10484 bytes
SHA-256: 0412394a054b46dd1606657dfebc5efe2e8292623c91a182a9d158f55f5a660a

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