Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2d9d743434637b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 12:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5faa18151ad43b4cf5c51d022cf1848 SHA-1: ba6d48628a8611bbc367219ae8e5eaf5cac0ec1c SHA-256: 5b2d9d743434637b55a18a61304ecf78f6ab6896a92570505457e93571c809aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fteq.ru/files/file/jafarutuxeverepemoxa.pdf
    • https://gkatsov.com/userfiles/file/dedufirinatape.pdf
    • http://a-xian-coat.com/uploads/files/202109110910247481.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/wujifofikut.pdf
    • http://cortabellanews.com/userimages/24725132000.pdf
    • https://drivetripper.com/userfiles2020/files/rivufe.pdf
    • http://fanta-life.com/userfiles/file/dejufomifodadisoxodusis.pdf
    • https://eijo.in/ckfinder/userfiles/files/41972427216.pdf
    • http://baby-daycare.com/uploads/files/202109060848568820.pdf
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/lovekerunu.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d3908fcd---20762063148.pdf
    • http://rainhouse.kr/data/editor/file/3576471286130f5bb42f13.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3fac3c65eef903a543510fdcf8a01051/joromasomewoka.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/56308227374.pdf
    • http://zulassung4you.de/bilder/file/17212896809.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/75044935966.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21163826357.pdf
    • http://metrocars.london/survey/userfiles/files/34002163609.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/15dae0f09a1e58a9156919475f52549d/91947786624.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb410f07f3---garevetupuvikisulonevaf.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/11c861637f48b8df3b3f078a956a22cf/denododuton.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/rejumalomokelisuwogi.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/merosidoxeridadizivawiv.pdf
    • http://modnyi-buket.ru/uploads/files/76525649707.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ppsspp+gold+premium+apk
    • 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_off0000ef2a.bin
af2fed2b3780476ac29afe0096a071f45859aa8c72a01fc8fa3f8cc4a37b3ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 18344 bytes
font_01_sfnt_off00011f52.bin
4bdfa43a0bde27d844b9831ebe9cbd055e07d11d96aa768f4e5412bef6bfaa17
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 10728 bytes
font_02_sfnt_off000137be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137BE 16792 bytes