Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e253109cf6e1f95…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 22:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 621b6e9baf1d2f32da08a7c60b14556b SHA-1: a3a68d5ca819590df15bd531f94f336ecb8866a7 SHA-256: 1e253109cf6e1f9578c78647d4e909c44d89227d9b1fad565c6b292d995ec3c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://andrewsexes.org/clients/867461/File/68371027725.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ccd32805---diwumanodavofizesavijom.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/63233791996.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/xofozurox.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5d90a42b---29945058146.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/51920672731.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/30704839505.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/89674657952.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd8f8cbac0---17454559450.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/dg81mehv5pntouqdmop8mdpo3o/wafulexamigokozogokotaxi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16098518768665---41232831787.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a09132a4c---dubesatebanudozoxukinet.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/fetupewuz.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/63089918722.pdfIn PDF document text
    • http://faradbox.pl/files/file/bomiwomere.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/5266309042.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/10363442953.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/gipisuwuko.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083caaaa700b---sodogaragewalimesorax.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/afd393f8455b9ed449fa283980f51ed7/gibugoxulurase.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/wituwavebigiwosiranos.pdfIn PDF document text
    • https://melz-feu.ru/upload/xogutizunupoxa.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wojifeni.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2dd7b2c8---bajoduridip.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/nupatomarigadimexiwewo.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tusavurusepikoka.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8e49db63---63589958069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=leer+hermosas+criaturas+pdfPDF 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_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 19240 bytes
SHA-256: 9f05ba88232262a7b7d45b6684077e4eb440a8aa0fedc28f2339cdae55d90d48
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 10792 bytes
SHA-256: 4c6f770c5be1d8335004f366ccaeba0fa27efbdc1cb917e6d0485ff5bdee1541

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