Malicious PDF — malware analysis report

Static analysis result for SHA-256 840dfbfb07aa3b91…

MALICIOUS

PDF

84.7 KB Created: 2021-08-19 12:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8db1ba4e9d831860d0c62f907837c719 SHA-1: 964ace67ab1aadd13aeda430de6120633f3cc63f SHA-256: 840dfbfb07aa3b919181bb2f05d0f6b0f740cd2aaeb0147d161285910c9945ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm. The primary function appears to be redirecting users to malicious or phishing sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=what+are+some+uncommon+boy+names PDF link annotation
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c2a3a6a5317f8334ce45abbc0edbcb6c/vejamib.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/dokaxesofimatazezijow.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/20828678934.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sovosutepabupetewedotefow.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4fab6901b---32945138459.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/bexofidudiluroxo.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/51700904849.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/10373818392.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ae2cdf4e---dagepusalowa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b40351a2---buwurinemomotafilenepamaj.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609999705926c---kenezadegudefivilun.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/guxijodetinatidiwuxa.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2577ce7ecc---2493774410.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160de69734ac11---87959916093.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/80498950525.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117c6a6b274b---10523619588.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffd4a31d75---tozugavigilumedijovagugi.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/sijolozebigulizozuletoxow.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/34868762954.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/visenapane.pdfIn PDF document text
    • https://bfull.ru/uploads/files/91466200119.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0746901001624214005.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/vujavidamo.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/8406904382.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/pupejiviladojerodewuxiw.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/78060925257.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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10704 bytes
SHA-256: 7aa8caddd1e728c314ba2c95e4749652023e2346d53eceb04ba982c98bbbb0a6
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 16812 bytes
SHA-256: 6e25567d829650c87058e1271b4e1b072b97b18748cac6a1cc6937a5d795bbb4

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