Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec9af88c70a74f4…

MALICIOUS

PDF

83.5 KB Created: 2021-10-06 06:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 4afb6393079ad221f7e8b6b181686a14 SHA-1: b1670cb820f756481978b0086886edbc91afa720 SHA-256: 7ec9af88c70a74f4b312d64deee55e73daf0cf8bd6dab0e67def03e13e3b4fc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://solis.altrodesign.eu/ckfinder/userfiles/files/ritowiwudedatinu.pdf In PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/nevolalalomupajopo.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/26344119592.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/47620009738.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fm602381n9iob2vt0v3o38uuk5/8620329782.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/dimamabujisozumiw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e2e4cb3a3bbb2ae110c4f2bdcb3f48d9/vanagovexefedagoxeto.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/xafomunawuvolezulixoz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615ab23d5dc42---popomibizozojopepo.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/lowomu.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/37303643975.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/jaxijidan.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/tikedilozadipefukin.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/2264894711.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/wenoporonuk.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/sufuvunebodosiza.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/71346193365.pdfIn PDF document text
    • http://agrion.org/upload/fichier/5107673840.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/21018167752.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131d55a1d8da---ribodukidakexigikaz.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/mebuxevuvesaguzamesasidaz.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/jiniruvigime.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615c0b8d01a1b---jibanidupivapafoles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=third+conditional+listening+exercisesPDF 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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 19396 bytes
SHA-256: 7473c702db4de9e27de408d7656f00df7ad3bf7238d12a05ebb176b8461fe2df
font_01_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 10712 bytes
SHA-256: 84e07516e5b725b5fe8be47cf59fdcaab76e839f694a09bbfd6d490a4946cd7b
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1