Malicious PDF — malware analysis report

Static analysis result for SHA-256 792468347908360b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8291521b114500e6cb7ab39294c1ab60 SHA-1: f6cdc669bc4eb1ffb4ff805324168766361f1583 SHA-256: 792468347908360b803a17b51ba6d13582bcd34fab1edcd33a50f2b4d8a30357
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

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://nomylo.ru/uplcv?utm_term=live+wallpaper+iphone+10 PDF link annotation
    • https://mallncart.com/userfiles/files/90551212612.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/wutebovotubajulawi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3cd776b04---20895312411.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b616d53ce59688c1857527d542bc2b6c/metukiko.pdfIn PDF document text
    • http://brenderup.ro/mm/file/97502276511.pdfIn PDF document text
    • http://93564497.com/userfiles/kodurafofozox.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210907081802.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/bewepakakimazoliremi.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/20669840902.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/wuxidapenaxoxabodafabim.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109090051073424.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/99216824737.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/17361912483.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/32361ab49d4f94ba9c92065b67da90a1/32792150987.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/genobiwojisivifutadi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/17548889224.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/xokaweduna.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf299c8ab8---15239420798.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/69186673303.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/53033203908.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/namewisufugokulezazu.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/66380192047.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/kafuvejafi.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wemozutukuwarixevozuxidof.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/63926457926.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufurum.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fijis.pdfIn PDF document text
    • http://52963566.com/upload/file/202109060302304181.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_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 10368 bytes
SHA-256: 56ca924361d1cf3ae4cacb459ecb639441adfde4992aa1416333feafd85fd47c
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 18208 bytes
SHA-256: 086f7172447d54d67bfed28a003b3039618b248ffbc141cf3721c5a00cacf858
font_02_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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