Malicious PDF — malware analysis report

Static analysis result for SHA-256 2979793736598660…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 15:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77d3969768c29759a104a8edb4ffa987 SHA-1: c3914f18d5d4993734b92a5a76c7ce946f9358de SHA-256: 297979373659866089fc8655c26b57406fd299b766fde3ec51bc7e11de5ae36b
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. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimnazjum-krasiczyn.pl/img/userfiles/file/26562744759.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614961731ce13---19121178199.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/fozugotixotepal.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/85592011638.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/trhovp85ndsmnu33tq5mq4cc1p/xibavedugotadubi.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/26309984719.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/jotiwufujorepalulo.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fojisusotelu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613615e05bda8---61451570983.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/nuxamadimulof.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c289cc382---gimifekef.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/65879925392.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/10900135651.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/7501648651.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/44744418875.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6768b538---46771501487.pdfIn PDF document text
    • https://allianztc.ro/files/file/jefafenuron.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913203503.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/rozunopabijopamusikeli.pdfIn PDF document text
    • https://penal-garazh.ru/files/wubofeneneweroroka.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/45394780229.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/gesepusab.pdfIn PDF document text
    • https://adikmanis.com/contents/files/38624150999.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/17273445597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+download+facetimePDF 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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 16576 bytes
SHA-256: d7cdb2719d84683d3c569da3b52606cf1ead99c0c992f8f94f1aa36533f53127
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 10700 bytes
SHA-256: 283f6da81f84e9540cc9109c66ac378b338d4b7cddd983a618177cd8ce63f776

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