Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95b97a3115e65f7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 03:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7cecde2ee08afca163c6d86b0b239b5 SHA-1: 1f5664a06aa9581f5fb9d69e5ddfe78ab196f660 SHA-256: a95b97a3115e65f7e6610a6e7140803298077de0bbcfee47f6f5142950cf4c3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, directing users to numerous external sites, some of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for 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://it-remarketing.pl/app/webroot/media/files/80728270182.pdf
    • http://www.petercar0937494634.com/upload/img/files/witugazoluji.pdf
    • http://espokebar.com/uploads/files/31635771122.pdf
    • http://cncsprings.com/d/files/tewodowoju.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613246f082672---91533717386.pdf
    • http://budaikepkeret.hu/uploads/file/13254977402.pdf
    • https://krygina40.ru/UserFiles/File/16509548758.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wejagepo.pdf
    • http://e-sportis.com/images/upload/gofawufimuzularameli.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/gupivajeros.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/pipiguwubefi.pdf
    • https://bacsionline.net/userfiles/file/tixelodafa.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/vozalapixulujajilogud.pdf
    • http://conservativista.com/js/ckfinder/userfiles/files/54945711794.pdf
    • https://dacola.com/upload/files/nevujapepivifilufagira.pdf
    • http://chamdure.com/DATA/files/fabupetosumuwilexida.pdf
    • http://ylphs.com/ckfinder/userfiles/files/juvulujogagezakexuje.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/57046214022.pdf
    • https://kristaldicarlo.com/userfiles/file/24874536362.pdf
    • http://cesishotel.com/res/wysiwyg/file/52721491788.pdf
    • http://sukhonthip.com/file_media/file_image/file/15468221563.pdf
    • http://xindeshiye.com/uploadfile/file///2021092008495723.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee7718ec0---rimitasotomato.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=push+up+types+and+muscle+groups
    • 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_off0000d5ff.bin
572061023148530162806e2a804af7cb9c27133971e2c964f49a56ba11b6f61b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 17784 bytes
font_01_sfnt_off00010459.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
font_02_sfnt_off00011c70.bin
c2827f532c23fc813cfe031bc4e6b6f5ed356768e2e6d844dc1c3f8c7448c47a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 11084 bytes