Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9caa8f5f4fbf13…

MALICIOUS

PDF

99.8 KB Created: 2021-06-30 15:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95241b0df1c472c7a6144f47d97c480f SHA-1: a3789a946660960dcd45d1b81795b2ffc3da8982 SHA-256: 2b9caa8f5f4fbf131f2199591aa1b5af5f7a99a46303f4b26310082e5fbee1c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The embedded JavaScript, though not fully analyzed, is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://philabc.ru/uplcv?utm_term=celcius+and+farenheit+difference
    • http://onlineticketreview.com/images/file/gabonaduvozuxuzaxa.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/229fd70f8b3d662ade9ee8cb1dc2dd66/balimosijiximezomigu.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/52f43de197c6ceb517c914baa3c4c0b6/4335162111.pdf
    • http://zeroseistudio.eu/userfiles/files/vasabukavevewapitedufeju.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85587918d---kixegadonopenabulagobus.pdf
    • http://kiavysocina.cz/UserFiles/File/zimatoxekalakakakakezugi.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988ad0a9a5c---8460595550.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608439adbc20c---83520686733.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f73b76c50---fewewetuzovumifakulipipum.pdf
    • http://hzbmsj.net/images/upload/File/nitutebazixarijotux.pdf
    • http://giwajib.com/ckfinder/userfiles/files/zogot.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2f038a9eccd9d4397c80a16985e37ea4/ginovuzopilikixukefuxagig.pdf
    • http://asbu.net/uploads/FCK_files/file/30341961536.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ah3fkmkaqk3tvme8keo3f3po8d/29682143229.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c21d307ce---306938824.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8283e8d83dcc12a2bf9bb25387207e68/37898821626.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c483482a1c4e935dd93bab5f99ea9d37/1956852033.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c20758d6140a8205a4b2141bea306aa7/76602792344.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nb2ec53dlvcd9pb057qlqj812h/96879089781.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9ee140817883841de08da3b5c990addc/xafekubodopavixikofol.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c02d7254e294e45d9874e65d8349ccc7/nulefunojodedosetoxenur.pdf
    • http://yuha.be/_files/file/562888203.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc07a2aea0---futesig.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/wugoxa.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a73aa859b4a---46342331602.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c00a7670a---jinuwedajozoremesuluj.pdf
    • https://systematix.pl/userfiles/file/tapenurokoxoxosonuvoxa.pdf
    • https://langumeistras.lt/i/File/lapopitax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 16792 bytes
font_01_sfnt_off00013479.bin
4104eb621b347eed43155f0b1fe4d6926b71398a7f2214f5658df05118627eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 10584 bytes
font_02_sfnt_off00014c88.bin
9030b6cb121c04fce3cb71f543718bf39564b86580e8c94cb61e27222cb608e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C88 20224 bytes

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