Malicious PDF — malware analysis report

Static analysis result for SHA-256 679a112e2809d18e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 11:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f61ffc782611bfabb836ed5d0d963b4 SHA-1: a59667884bf03fe85cc552532a1a31d8a046176b SHA-256: 679a112e2809d18e429bdf8cb39eb54226caecfcd904080c9ce8b9272ad01dcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+pc+game PDF link annotation
    • https://siroyensao.com/upload/files/6496926874.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tutiruzurapujojam.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb6926e71---12199219366.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/vereboxonaji.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b45ec4c3---68059886464.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/lagopelurozetipimo.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/reberafilezagifan.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/tatip.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/xusuwizoguwazixuseju.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/84647309569.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613505c950128---piwiratedejupukusi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/l27ed7i6oh6bgtgr2pl2m7u8vb/risigopagezogipeguz.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fifimagaga.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/degagatamaruvap.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/foredotas.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/62d88650d7b978853e9a088262a18d03/torakejibetajunifew.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gakijarudimigilasat.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/38673808580.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/24021526797.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/56748943992.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/9321596930.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/junisonupewavejive.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6654288442a2ba9f5c80682faa707ee7/zerutovutej.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/tudejidugebigadugijiz.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/28936380950.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/84748846706.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/97520374573.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 18444 bytes
SHA-256: 49b7795ca80e94f3e6fdd04068d483d543bbdd4ff1b8e28a0a8d417064469793
font_01_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 11100 bytes
SHA-256: 0c2125c3c5f751ebb2c0962a6519f19da6de13af7b7554cbf03c4ffd7ea65f00

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