Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5daec4353b7fc5…

MALICIOUS

PDF

82.6 KB Created: 2021-08-18 03:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9afc81ad8c2df5b2f40d5292ea7a2c35 SHA-1: aa47e34a15fd45f9447ffb3e521812e34f7cdfb7 SHA-256: db5daec4353b7fc5d4cddb9e785786f5d0cae407ef1d30b543d715781f08d5e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript and a significant number of external links. Many of these links point to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/1354d0263326823572b2b5cb31911acb/78529414181.pdf
    • http://volareinmongolfiera.it/userfiles/files/mosumebobunepomivagamamut.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/rakolufubexajovu.pdf
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/32036746763.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/91881127413.pdf
    • http://connect-senior.ch/uploades/userfiles/file/desek.pdf
    • https://gonguyenkhoi.vn/upload/files/likulu.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1f7e9b2b0c1e757a0e4a2a47602a1fd1/mikatexadabowiwuduvezukum.pdf
    • http://dspec-car.com/js/upload/files/puxadikimidonizuke.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/7788463102.pdf
    • https://cardion.dk/gfx/fckimages/file/tetapedijidasijubabirabep.pdf
    • http://frickcontrols.com/uploads/files/gazojabixokavemupanijajo.pdf
    • https://nabsangram.com/userfiles/file/foxodogiwuw.pdf
    • https://promise-land.com/upload/file/36267190017.pdf
    • https://soccerauquebec.com/userfiles/file/fedebodolenesoje.pdf
    • http://avvocato-callegaro.it/public/file/25041287844.pdf
    • http://blesk-stroy.ru/userfiles/files/28163532498.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/48561094161.pdf
    • http://thedewakohchang.com/image/upload/File/egemegowudilerabovavugut.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d408ec519f---63987095876.pdf
    • https://larustt.com/upload/ckfinder/files/dusibibap.pdf
    • http://gildiamasterov.ru/userfiles/file/41102620086.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/84ec02355b7f2adaaf563a99583ff9bd/97309755706.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rockstar+full+movie+free+download+720p
    • 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_off0000de9a.bin
921a408aaa036b88b7fc0a4e8c0c638f2965784ca70fc410e7b2628075fe1e59
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 16960 bytes
font_01_sfnt_off000109ec.bin
493e766e68d8fc47af32b3c276e2844e83e2880d2825b93bec02520595c6ac20
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 11464 bytes
font_02_sfnt_off00012532.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 16792 bytes