Malicious PDF — malware analysis report

Static analysis result for SHA-256 72731be0ff2ca4e5…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 04:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de04b58885a1862310610612c2ed6792 SHA-1: 97a30535c86d11a270f90232cdc735861fa321e8 SHA-256: 72731be0ff2ca4e5f304bc54921ffdcbd6e8c65576122c36ac7f6cb3ccb7c3ba
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The presence of embedded JavaScript and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicate the document is designed to trick users into downloading an encrypted payload, likely to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://webdulich.com/js/ckfinder/userfiles/files/lirojunajobedabidimara.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/605d115c1984b39d3d9cd3dcbea67fff/5085482388.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8192eada2072a2ab64c78e6a16cbc3b1/95260955965.pdf
    • http://0-50.ru/userfiles/file/xuwevibevi.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/75e6192aec033ef198083c32b77c4c47/32333264036.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2898d878f---46355156897.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a2996f5d---98558148075.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ab5c5b075---tasogelibupugedakomoto.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c727b73496---89367719609.pdf
    • http://prinsart.ro/uploads/files/guzezeti.pdf
    • http://alfavit.tv/userfiles/file/32019166519.pdf
    • http://cl-pub.com/files/files/7506137171.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27df2bbe7---jomoku.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/51ohjujmrub9lbcndaqv6ka031/62564933149.pdf
    • http://cpgny.com/userfiles/files/45699671934.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160712d6a3cc87---94210437438.pdf
    • https://xn--nmqu14inmf.com/upload/files/85774408293.pdf
    • http://tencanpowder.com/d/files/zadogepowevozujakifirad.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2fbdfacd---varopukijev.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tfqekfgro4uj99bfkkeqa957eu/57595943330.pdf
    • http://vtvxm.vn/userfiles/file/13072428003.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f580275c---5572697607.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15fd6edec9---32703292603.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91acfbf50e---gigapavinoxatamufen.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a576e03f12d---somolagogukasi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=word+unprotect+document+without+password
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfc.bin
82233368e603ec823c1a0bb7c779013c33e042662cf8ed95f238a63dc2552d33
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10912 bytes
font_01_sfnt_off00010520.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 16792 bytes
font_02_sfnt_off00011d32.bin
9d5e9307a3f0576cff821e77ed6262c7631afcb81f03161f744e907ed795c385
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16628 bytes