Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6c282412d713f5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 11:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6905f576358c41fb0cfd9a2837dd8e81 SHA-1: 2f0d52cf5abf3b9097503c6af9c40754528ea5a0 SHA-256: be6c282412d713f57c8ca34982b0a081e7e97a3360d71d8303745eeaed25ff6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brandweeramsterdamamstellanden.nl/userfiles/file/64221696511.pdf In PDF document text
    • https://vnycc.com/userfiles/file/gagumajidonipedu.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/6773042887.pdfIn PDF document text
    • http://airzo.net/userData/board/file/96308704003.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/61895132207.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348496c11a4---12356886780.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/zevipusis.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/vexopesi.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/samemiganibi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/46qpvmdcin462r96ut7fh8o80s/10452173740.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354a5231a0c---duburumezabarubokag.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/jobusovajozidagifojubog.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/laxibetozinexaraxi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613259b37b19f---81518972270.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/93260084232.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/xemelosenak.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/73210781972.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zulam.pdfIn PDF document text
    • https://carlojans.com/cms/file/60521519710.pdfIn PDF document text
    • http://becucci.it/userfiles/files/94716480748.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/36275347185.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/54997412301.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/88010500214.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/48729947858.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/3361297226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+increase+tethering+speedPDF 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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 10824 bytes
SHA-256: ef2d02c943ddb278c5c79feea2e2df054a1d8f2a46e6eb64a1cd332666b484ab
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 17668 bytes
SHA-256: 4ff8a8acc4733b87b2749f63fbe161ec2855d00ef5c6370d27379a8f31f1a0aa

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