Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f361dd14d02999…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 23:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 404bd3911ed66789cfba789cbbf2dd03 SHA-1: f189301c74055c77426cec2c6867498306e939f6 SHA-256: 36f361dd14d029993a2a05057dbbb1f370fe5bdb6ba066214c88c748d886c1dd
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple links to external sites, some of which are hosted on compromised WordPress installations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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://crescentcarpets.com/userfiles/file/zigezopiwaxasefap.pdf
    • http://kristiankutschera.de/userfiles/file/kanelipikasewom.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/700f5a9ef339b20690ea461d458b0d2d/pogerozaverowaxawuxe.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b216d226400baccec14e7c6f1178b360/51772818114.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/11425684047.pdf
    • http://pecsimutargygaleria.hu/files/file/64604207269.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/98135226169.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zadedotimojopabogusunuru.pdf
    • http://riskhedgetech.com/uploaded/file/1442076918613300488f6c1.pdf
    • http://masan315.net/board/imagefile/file/gufixinegibewovot.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/83683519370.pdf
    • http://cuatro-pr.org/sites/default/files/file/9994146215.pdf
    • https://larioenergy.net/uploads/file/gexoxegokazemovebenazaxud.pdf
    • http://staceyasp.com/UserFiles/file/judifexekozegebivona.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b400f00dc---fijenipapof.pdf
    • https://yapluka-services.fr/userfiles/file/gidowisudibimas.pdf
    • http://kbchina.de/upload/geremaxorepumijawaxape.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161401bf43ff82---80759726218.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/zepajadajotikifu.pdf
    • http://marcth.pl/media/fck/file/43801003878.pdf
    • https://vroa.pl/chplusfiles/file/setafubix.pdf
    • https://samsungklima.net/upload/ckfinder/files/22064332724.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/rajajewikunabowosapo.pdf
    • https://a2designbg.com/userfiles/file/pokewizibejabavafimevezot.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+pasar+fotos+por+bluetooth+de+ipad+a+android
    • 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_off0000dec6.bin
f9efc62f0605d0ef922bd0a3d5e6a252d2dc131c254bda6cd9b51eb89c59a55c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 19308 bytes
font_01_sfnt_off00011015.bin
8638137afe8388e76d6840b9deec2db5c40944a9ba770e4b836c4361f8252dd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 11032 bytes
font_02_sfnt_off00012950.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 16792 bytes