Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68096fd4405817e…

MALICIOUS

PDF

80.4 KB Created: 2021-08-19 21:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77bd517c3a47120efd3f5b4d90d88a54 SHA-1: 1a03304af965036194763d753b451229509ead2b SHA-256: b68096fd4405817e7e7795f7d816b5df8f529422d89a494d17cd49ca22834166
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be redirecting users through a chain of links, likely to a phishing or malware distribution site, disguised as a document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/67079411671.pdf In PDF document text
    • http://carszana.com/image/upload/File/boboroxulowuvorewijoxorix.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/najn9jfimhkn3tt9a8489rln66/44642311074.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe76815083---26289689059.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/xokobamafukuxivukaposa.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/9737917184.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4ilfeqr0okpblmramrfr3d9307/kuvelodufofudemixu.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/67394665335.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/83581562006.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/pilozusemosikuve.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pq9jui45gjcheldc100ibql6sa/jefonade.pdfIn PDF document text
    • https://digireg.se/upload/disoredifobi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41e187d8c---nirugejuwusati.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/60569502052.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/47674781446.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3cbceedf3---19372266807.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/muwixusorojozesukijafeve.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0892a23dda8085234d599a810e64e755/21174014517.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/te5g9mcbng4d4rtj8njc5vj4ep/peridabi.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/37922216864.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/62824134697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clinical+ophthalmology+jatoi+6th+edition+pdf+free+downloadPDF 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_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16952 bytes
SHA-256: 3bcbe0ad6d50d707bdb45a427d70aa173dfb5227e91b0380e315a9d0769df337
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 11428 bytes
SHA-256: 96d0d32fdddcac44510b829127b053f6d8d2cdcddb7073e8b1a39f469ebdc4be
font_02_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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