Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acbe5cc2a9131f8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 21:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7b1bec6ae9dd4f96bcdff66c90f419e SHA-1: c40222ab060c6ae3477e357d3c3e7aa7ef186c56 SHA-256: 6acbe5cc2a9131f828132e8c1b9419e7b3887dea76180f69eb8bc65bf38c03ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. Several heuristics indicate the presence of link farms pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.tvmreza.tv/ckfinder/userfiles/files/38578527683.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613700c5e6e13---loduwofizefizisifuravuso.pdf
    • http://sicilyontable.it/userfiles/files/dudenufevituxujug.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/15633563562.pdf
    • https://arhstroi.by/uploads/files/63590079911.pdf
    • http://lehnerkom.de/images/uploaded/file/losetudesugu.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/20d0fce62ae4920cbe6a69a41a809b27/24895716717.pdf
    • https://m-astar.com/UserFiles/files/1747461332.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee666df8f7---tukaxamuj.pdf
    • http://dongphat.net/upload/files/dozewuxavelegazeka.pdf
    • https://anmimar.com/royal/userfiles/file/kejalereg.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0cc318a3c---8317078400.pdf
    • http://finalstage.biz/js/upload/files/90273798426.pdf
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902103434282618.pdf
    • https://myparrotfood.com/user_files/files/japosoruw.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zamowofijoduvudi.pdf
    • http://mprime.net/ckfinder/userfiles/files/58982962694.pdf
    • http://trans-serwis.com/userfiles/file/20478226968.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161392c8d33155---14256369879.pdf
    • http://pbpharm.com/upload/files/88643619757.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/luwezudazifobiz.pdf
    • http://anpo.vn/upload/files/ritotewomidenulojatug.pdf
    • http://viquadro.com/userfiles/files/rezojo.pdf
    • http://cbcom.eu/ressource/site-image/files/nebipok.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/patibazifomup.pdf
    • https://jotelek.hu/files/file/92550479673.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+can+i+share+my+phone+screen+with+my+laptop
    • 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_off0000d97a.bin
01cfeed073c858a6a106e7ff661e37c4aa626ca7f26c965a9917677bd98bd078
pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 18796 bytes
font_01_sfnt_off00010970.bin
4c8e30bf31f20e74f51a24274fbcae240fbcd7804f18847e27db793bb4b859a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 10832 bytes
font_02_sfnt_off00012248.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes