Malicious PDF — malware analysis report

Static analysis result for SHA-256 25172afa4a3f54da…

MALICIOUS

PDF

68.5 KB Created: 2021-09-13 14:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 523aec0d7236a73ce2bda2db9241ad27 SHA-1: 2fa94ed315d48c6c47eaae1927f00b4ebea64ad9 SHA-256: 25172afa4a3f54daee09ea7c87dff4683990cb4da653e7bfd4ff9481bbc644d6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm, a common technique used to redirect users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7138

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.
  • 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
  • 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://chcial.ru/uplcv?utm_term=where+is+my+file+manager+on+my+android+phone PDF link annotation
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/tipazuvunagigavajite.pdfIn PDF document text
    • https://quizai.com/uploads/files/99696358637.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/85q0282cgns5t424cj6248c3ro/36518833782.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33309a1c4---nudibaxidopa.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/wajizefad.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/200bd06199eeae3c3d84c231777bdd5e/36218650082.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/40557004816.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbff259c4c---80286063102.pdfIn PDF document text
    • http://vit-physio.de/file/sujajinajafijib.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/76237553080.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/70663470274.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/befizenoja.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/zuxenofox.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/22716105431.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/nosudulika.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210909_183748.pdfIn PDF document text
    • http://yongqingtech.com/d/files/mibolupiduwadiz.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/467830683.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210906150934.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/19631610243.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/poxorova.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/17189851828.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109112127472220.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mifexazakulun.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/lodovatalofelanakavazu.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/75471676984.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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