Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3b41d63f513e12…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 15:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b250b8952d989dc17662270d69315e72 SHA-1: 36243563549f6ec307d9eda32340089cc2fabe5b SHA-256: 3d3b41d63f513e121092998ef1c7502bde5462689ea83d79372536577b71b315
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many pointing to compromised WordPress uploads or disposable domains, suggesting an attempt to lure users to malicious sites. The file's structure and content indicate it's designed to exploit users through deceptive links rather than direct execution of embedded code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://arniuniversity.in/ci/userfiles/files/komofod.pdf In PDF document text
    • http://jtylek.pl/Upload/file/bitajobas.pdfIn PDF document text
    • http://tid.vn/upload/files/52096314525.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gulokugeminafakoge.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/danijufowuzetazo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sng2ast0fc88jk95sfpvfsspg5/8177719876.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9pp1ktiu9j9lt70i68rk2683sv/vezuzi.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/42b27ebfb3c63c3a53e827a08a586546/pelefepuzekunil.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6bce35bc---nozapuzoxuzemanukewonur.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa74b69b055---gerila.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/khq6j0321qrk7qd66o260a8464/43327570167.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/104c343312e91d64da2e6303d8e32639/76825272359.pdfIn PDF document text
    • http://www.bandungmesin.com/file/49018161152.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846875d652e---vetamejujedosuvebowifer.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/12399921185.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2do7354jh4g7rullqrub2vp2p4/kuzifujejinug.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wudavisebijuduvosori.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/kugikevipowafagazejap.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/foremimuwinewojerosux.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/71f6d7b7e2086bd79831513b15ebc098/nixabipepekogu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16129df850e718---45409824044.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d820c1d6ac---bapumexoti.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/togofipaxelawum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=developing+listening+skills+2+pdfPDF 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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 17588 bytes
SHA-256: 146461a1eee6f4af58ac05d4beaced14ce156a0c803e30b90ef4d434304424c1
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 10688 bytes
SHA-256: 400f969c6496953aa6e806399d9610e9e07a6fa317ae63d9be8a184d936fb590
font_02_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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