Malicious PDF — malware analysis report

Static analysis result for SHA-256 520d665714ce2056…

MALICIOUS

PDF

93.9 KB Created: 2021-08-02 15:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ba6fd0319c4276ad34f883c57b47280 SHA-1: da8668d66ba38e9e93e10b41cc135f019788587d SHA-256: 520d665714ce205627c53f91bac28d7c339624940c31fc9d1c90a7b3f9aa742f
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 uploads and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c292bc8b50c---fupekedipipemofenat.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e1e67113ff827f5ea0ac87d490e50ff/vepubuzowuwovenufeleril.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/71790870846.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37ba886e87---velidesagulapapuxezibi.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b839dd7f6472c1a6b0f7c4e87a295784/dijeromobiwuxopog.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/jukuzab.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ifnn9vbrph3jbrm99ulkiqq7i6/fidelubozabe.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee53e0799bb---61798363552.pdfIn PDF document text
    • http://scro.ru/pic/file/foguvavef.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/200010ad8a58459d589ebdf901521979/tibasepudisopanivoza.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/up6vckgf7sr9tgub8hj5ioecam/92115835604.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/morejixulexegabokafute.pdfIn PDF document text
    • http://aps-mes.com/files/file/zininezimunijagexapewusi.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/19/file/20210619_070556_128.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/ludurorosebuzekofoneg.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec35930ab---penebixubodinomagetebafif.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e5510bcf---fipejekosawol.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/digabojoxopidonemowupulug.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa973ccf0a3---67661669795.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k56rgnogtcn640leljjvsrkhc3/87730031975.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/56021062816.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6ed0101b9c25698b015658088803c54b/57801758256.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a16878ef3e1---rolusebejuxiluvemesak.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/negogapo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160882347682e0---14498264330.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/10290406d3a855ca3097f54d1e57a4ea/mipuseli.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/75332106857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hollywood+movies+dubbed+in+hindi+tv+channelPDF link annotation
    • 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_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 18476 bytes
SHA-256: 29b8f1e72715e24fb7bd6227ff41a8e980c2ca4592e4b16a381cfa4d4920d12c
font_01_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F21 11032 bytes
SHA-256: 708f8880afdcb954e4008dead2d05d86cbe21583f93b2b224b63cde3fbed553a

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