Malicious PDF — malware analysis report

Static analysis result for SHA-256 839e633c889d0f5f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 10:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 61e812c98a9c7ff5ca0cd14a8c1970a0 SHA-1: acb744b11e63865170bbaf1d9a8011c204fbc796 SHA-256: 839e633c889d0f5fe970922d8e13744ccb39b3070feec3e967ddf722fed0aebe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=android+system+webview+disabled+for+user+owner PDF link annotation
    • http://menifee.hanasushichoice.com/uploads/files/jidaxenegeborufaxuz.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/musodasirojaxiweginufe.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/af592d76020b038feb8b36669647a800/8564647772.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/77441538321.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/86816436677.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/zipodofasubozobaxebategur.pdfIn PDF document text
    • http://4rrecycle.com/files/file/juxizeri.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/71477439398.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/90337348449.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/41046927187.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/josajasef.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/vibemixazifa.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/nikogaromuxaroporafur.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/60969196074.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/38180021141.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/toxugasagewolokelimowoxu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b472c34fcc24f8184fd255ff1a2b839b/vovigiwugijoro.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/2116927306.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f574b1e61---80458876822.pdfIn PDF document text
    • http://taigesw.com/upload/files/8348978417.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f8ecb7e70---veparozivod.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_off0000c91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 18036 bytes
SHA-256: b4cfc62416c89363d0f16137ee9fb7f8c91754f3970ba1e156ce17b938edd23c
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 11004 bytes
SHA-256: 02ff3cb8de20a23da96c482e28defd16a649a46be10d96a7e126968e991af3e1
font_02_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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