Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf38534fa8b7d0f8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 20:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09e180cc5790ca7f1d08fe6847412501 SHA-1: d6d5e4f979f86d528cf77d2626cd39ab11bb6ae1 SHA-256: cf38534fa8b7d0f81e8a0ff480dc5aee5671ac96c12bb67fecd704442ec9c364
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The heuristic firings indicate it's part of a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://queure.ru/uplcv?utm_term=math+in+focus+pdf PDF link annotation
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/54224414522.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9rsn625d58u4l8etdaeqq7e2p1/taxilapadewoponesase.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f916b267051f16d5d4a0feec95c7329c/42164932752.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/89754397008.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/fajimisiri.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/rifewurijusasexet.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/86712117058.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c6b69f766672a9fcb3732259f6bfc423/wonaxaxokafamixixun.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/33197482651.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/zerivovedoxametibisavu.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/tadaxer.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lugegazagetadejevo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fdc644bc91ad78c887c1c9bd153ae808/78001756071.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/71758834559.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zejixifav.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/57181145005.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/75426635502.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142026b3a741---tirivuwemolotezozuxup.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/mejunatorapimumog.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/16922560896.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ahq7bl9125phve3a5d8o7l8j4t/kegepakirigasunexinurul.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/75969227750.pdfIn PDF document text
    • http://brlairport.com/images/file/nizopedebuzexozolo.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/88cbe415f8c0f2ea4e441eb961dd0b1f/97025475967.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/30400043043.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/31771594039.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_off0000ce97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 10532 bytes
SHA-256: b8a4bdc6b2d7ae6e644463aa38a414e07b9eef6b8c5d9cc011fec7cdf353c694
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 17312 bytes
SHA-256: 8082230a3c66738fdfff3fc90447d782983f76d8bc03361a379f63118d6d1fd0

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